Reviewed – The Best Home RO Under Sink Drinking Water Filter Systems

Let’s face it: The quality of drinking water running through our water systems has deteriorated in many areas of the US in the last decades. The main causes being soil pollution from agricultural fertilizers that trickle into our groundwater, the increasing use of everyday pharmaceuticals and others chemicals that end up in our water systems and the disposal of waste into our streams and lakes which brings pathogenic organic contamination like bacteria.

The simplest way of protecting you and your family from possible health issues caused by pollutants dissolved in your tap water is to install a reverse osmosis system in your home.

Which is the best reverse osmosis system for home use, you ask? On the following page we provide reverse osmosis system reviews to answer that question. Above that, we make sure to find the lowest price available for each ro water filter unit. Finally, you will learn what you should look out for in a quality ro system and what to better avoid.

Best Reverse Osmosis Systems for Home Use – Comparison

SystemImagePriceOur RatingFilter Stages 
APEC Essence ROES-50APEC Top Tier Essence ROES-50 5-Stage System 89px$$4.85
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iSpring RCC7AKiSpring RCC7AK 6-Stage Filtration Unit with Alkaline Remineralization 89px$$4.66
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Home Master TMAFC-ERPHome Master TMAFC-ERP Artesian Full Contact System 89px$$$$4.97
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APEC Supreme Ultimate RO-90APEC Supreme Ultimate RO-90 High Flow Filter 89px$$$4.75
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iSpring RCC7iSpring RCC7 75 GPD WQA Gold Seal Certified Filtration Unit 89px$$4.75
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Watts Premier RO-PureWatts Premier 4-Stage RO System 89px$$$3.94
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Home Master TMHP HydroPerfectionHome Master TMHP HydroPerfection Review 89px$$$$4.89
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Express Water ROALK5DExpress Water ROALK5D Filter Unit 89px$$4.910
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APEC Essence ROES-PH75APEC Essence ROES-PH75 89px$$$4.76
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Ecosoft PremiumEcosoft Premium 5-Stage RO System 89px$$4.95
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APEC Reverse Osmosis Reviews: Top Tier Essence ROES-50 5-Stage System

The Good

APEC Top Tier Essence ROES-50 5-Stage System

APEC or Advanced Purification Engineering Corp. is one of the leading manufacturers of residential reverse osmosis drinking water filtration systems in the US. The company is WQA certified, based in California and looks back at more than 20 years of industry experience.

Like all other ro models sold by APEC Water Systems, the Top Tier Essence ROES-50 removes up to 99% of water contaminants like arsenic, lead and chlorine. When drinking the filtered water, you will notice that there is no after-taste at all! The 3 long lasting filters need to be replaced about once every 6 months, which costs approximately $25 in total. Compared to many other systems you can save a lot of money here alone – click here to find the lowest price for the APEC Essence ROES-50 and start saving money right now!

All parts seem to be of very high quality and durable. If installed correctly, you won’t have any problems with leakages. And most importantly the system is Made in USA.

Clear installation instructions that are easy to follow are part of the scope of delivery. However, if you experience any problems during the installation process or while running the system, feel free to call APEC’s supreme customer support with real US technicians on the other end of the line. This alone makes handling any occurring problem so much more comfortable and time saving.

The not so Good

The APEC Top Tier Essence ROES-50 takes up some space, but although it features a 5-stage purification process, there still should be some room left for your cleaning supplies.

Also, the system takes away some water pressure in order to run. If the pressure in your house is not high enough, you might only get a trickle of water from your faucet. That’s why it is important to follow all instructions precisely.

Bottom Line

All in all with the APEC Essence ROES-50 you can expect a top-notch reverse osmosis system that requires only little to no maintenance, features easy and cheap filter replacement and provides great tasting and clean drinking water.
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iSpring RCC7AK 6-Stage RO System with Alkaline Remineralization

The Good

iSpring RCC7AK 6-Stage Filtration Unit with Alkaline Remineralization

iSpring Water Systems LLC is a family owned company located in Alpharetta, Georgia. For over a decade iSpring has specialized in designing the best reverse osmosis systems available on the market.

The RCC7AK 6-stage under sink system filters more than 1,000 water pollutants out of your drinking water before remineralizing it to balance pH-levels by adding ionized minerals including calcium, magnesium, sodium and potassium. The processed water does not only taste great, it also eliminates the need to buy bottled water and therefore pays for itself in about a year or less.

With this product iSpring really tried to simplify the installation process – and they succeeded. Written DIY instructions come with quick fitting connections and color coordinated tubings and even a DIY installation video. All you need are tools like a wrench, scissors and some Teflon sealer. If that is not enough, you can always rely on iSpring’s superb customer support that is readily available if needed.

Costs for filters amount to about $5 per month, which are standardized and can be purchased directly from factory. By the way, if you notice a trace of water inside your newly acquired system, this only proves that iSpring has tested it for quality control before shipping it to you.

The not so Good

Depending on the amount of water you use every day, filter replacement needs to be done more frequently. Some customers claim that they need to replace the filters every quarter to ensure proper system functionality.

And what’s more, this under sink system is not Made in USA. But you shouldn’t worry about that too much. First of all the RCC7AK is WQA Gold Seal certified, which is one of the most recognized and trusted drinking water treatment programs in the world. And secondly, if you register your product with the manufacturer, you activate a free one-year money back guarantee. Claim your 1-year money back guarantee.

Bottom Line

In our opinion the iSpring RCC7AK water filter unit offers great value for the money. It’s high quality, provides exceptional clean water and is backed up by a 1-year money back guarantee.
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Home Master Reverse Osmosis Reviews: TMAFC-ERP Artesian Full Contact System

The Good

Home Master TMAFC-ERP Artesian Full Contact System

In the first of our Home Master reverse osmosis reviews, we will take a look at the TMAFC-ERP under sink system, which features 7-stages of filtration removing up to 99% of water contaminants and adding calcium and magnesium after the purification process.

Home Master (former Tap Master) is a brand run by Perfect Water Technologies, an American manufacturing company based in Scottsdale, Arizona, which was found in 2002. The company is known for its fantastic customer service.

The TMAFC-ERP comes with a built-in non-electric permeate pump to reduce water wastage by up to 80% (1 – 1.5 gallons wasted instead of the average 4-6 gallons with other systems for every gallon of filtered water) and increase water production by up to 50%. As you can see, the additional permeate pump not only saves you money, but also makes the system more efficient with a faster flow rate to the faucet.

Further advantages are:

  • Easy-to-change Filters: Filters use an “all-in-one” design. They are incorporated into the disposable filter housing. Therefore filter replacement is fast (requires no wrenches) and the chance for water leakages is reduces, since microorganisms and biofilm cannot accumulate in the filter housing.
  • Filters need to be replaced only once a year/every 2000 gallons.
  • Scope of Supply includes storage tank, chrome faucet, adapters with shut-off valve and drain saddle.
  • No plumber needed: The tubing is color-coded and installation instructions also direct you to a series of online videos, which outline the installation process step by step, if needed.
  • Click to learn about all the other advantages, too.

The not so Good

Apart from the pricing we could not encounter any disadvantages associated with this product. Keep in mind though, that it is also backed up by a five-year limited warranty.

Bottom Line

If you are willing to pay the price for this high-end product, you can expect outstanding quality and an efficient filtration unit that is backed up by a 5-year limited warranty. The Home Master TMAFC-ERP might very well be the best ro system for home use on the market.
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APEC Supreme Ultimate RO-90 High Flow Reverse Osmosis Filter System

The Good

APEC Supreme Ultimate RO-90 High Flow Filter

Again the APEC Supreme Ultimate RO-90 High Flow Reverse Osmosis Filter System is 100% Made in USA and NSF certified to guarantee safety for your health. NSF International is an independently run organization that among other competences tests, audits and certifies for the food, water, health science, sustainability and consumer product sectors.

The APEC Supreme removes 99% of contaminants dissolved in your water in a noise free filtration process (Lab tests have shown that the system removes fluoride at 97.7%.).

First stage features a polypropylene sediment filter that removes dust, particles and rust. Second and third stage use an extruded carbon block to remove chlorine, tastes, odors and cloudiness. The following forth stage is the actual reverse osmosis membrane. Fifth stage uses a coconut shell refining carbon to filter out residual tastes from the water tank.

Under sink system installation is a breeze and does not require a professional plumber. The super capacity filters save you money since they last twice as long as other filters and the 1-year satisfaction guarantee plus great and knowledgeable customer service complete the whole. View 800+ amazon reviews here.

The not so Good

One thing to criticize is the installation guide, which should indicate that it is important to not drink the first 2-3 tanks of filtered water.

It would also come in handy, if the feed water adapter would come with more options. Depending on your pipes, you might need to buy and extra adapter to make it work. Costs: About 10 bucks.

Bottom Line

In all our reverse osmosis system reviews, this product stands out from the rest. It’s exceptional high quality and almost all amazon customers are highly satisfied with it.
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iSpring RCC7 75 GPD WQA Gold Seal Certified RO Drinking Water Filter Review

The Good

iSpring RCC7 75 GPD WQA Gold Seal Certified Filtration Unit

The iSpring RCC7 reverse osmosis system can provide up to 75 gallons of filtered water per day, which is sufficient even for larger households. Thereby it removes more than 1,000 pollutants from the water in a smooth and almost noise-free workflow.

As we are already used to, all parts of this iSpring system such as a polypropylene filter, granular activated carbon and the reverse osmosis membrane are Gold Seal certified by the Water Quality Association (WQA). The certificate ensures bottled water quality.

In a test conducted in Las Vegas the iSpring RCC7 was able to reduce the amount of TDS (Total Dissolved Solids) in tap water by 95% from 506 ppm (parts per million) to 25 ppm, showing that the system works effectively under real-life conditions.

The installation process is easy to follow with additional videos and technical support readily available.

The not so Good

Every reverse osmosis water filter system wastes some water in order to clean it. This unit wastes about five gallons for every gallon of clean water. This sounds a lot and it is! But keep in mind that it still represents the market average.

iSpring has written only one instruction manual for both UV- and non UV-systems. Keep that in mind when installing the system to not get confused on where the hoses connect.

Bottom Line

Although the iSpring RCC7 has its flaws, the advantages still outweigh the disadvantages. More than 3,000 customer reviews show that the system is reliable and of superb quality. Make sure to check out some of the reviews.
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Watts Premier 4-Stage Reverse Osmosis System Review

The Good

Watts Premier 4-Stage RO System

We want to provide you with the best under sink reverse osmosis water filter reviews. Therefore we need to review a wide range of water filter models from many different manufacturers. So let’s take a look at the 4-stage ro unit from Watts Premier, a manufacturer we haven’t had the chance to lay our eyes upon yet:

Premier was founded in 1989 and has been acquired by Watts Water Technologies, Inc. in 2001. Premier is now just one of Watts multiple brands with headquarters located in Peoria, Arizona.

The RO-Pure 4-stage under sink system by Watts Premier offers you high quality at a reasonable price. It’s perfect for people on a budget.

WQA tested and certified 5-micron sediment and carbon block pre filters and a reverse osmosis membrane remove up to 96 percent of dirt, rust, silt, chloramines, chlorines and other solids that make the water taste and smell unnatural. Please be aware that a minimum incoming water pressure of 40 psi is needed for the system to operate as intended.

A faucet with a built-in electronic monitor lets you know when it’s time to change the filters, which is convenient for people who tend to forget about regular filter replacements. It is important to replace filters regularly in order to keep water quality on a consistent level. To do that, there is no need to turn off the water supply due to the built-in shut-off valve.

The not so Good

A larger group of customers have not been satisfied with the performance of the Watts Premier 4-stage reverse osmosis system. Criticism has been raised, claiming water leakages would occur after running the system for a couple of months. And in fact this is a problem also known to the manufacturer.

Watts Premier customer service offers a wide range of possible solutions and makes you go through many different steps, even though it might be already clear that the filtration system has simply failed. In this case the 3-year warranty does not help you either.

Bottom Line

The Watts Premier RO-Pure 4-stage system offers good value for the money, if the system does not start to leak after a while. In case of leakage customer service might not be helpful either, which is why we recommend you to opt for a different model that is guaranteed to run smoothly over time.
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Home Master TMHP HydroPerfection Review

The Good

Home Master TMHP HydroPerfection Review

The Home Master TMHP HydroPerfection reverse osmosis under sink system comes with the same advantages and benefits as the TMAFC-ERP Artesian Full Contact system does. Additionally, it includes an iron pre filter that protects the ro membrane (ideal for well water) and a UV-filter stage that sterilizes 99.99% of microorganisms. Water has to pass through a total of 9 different stages of filtration, before it is ready to come out of the faucet.

The EPA (Environmental Protection Agency) has recognized UV-filter technology as the number 1 recommended method to sterilize water. Tests have shown that UV-light is more effective than chlorine in eliminating viruses; and no harmful chemicals have to be used.

As mentioned before the TMHP HydroPerfection system also comes with a built-in non-electric permeate pump reducing water wastage by up to 80% and increasing water flow rate, disposable filter housing for fast filter replacements and less risk for leakage and a clear installation manual.

Also if you are able to replace filters yourself, you are not dependent on a costly service and can save money here.

Bottom Line

There is nothing to really criticize about this product. It’s priced quite high, but as always you get what you’ve paid for. Numerous happy amazon customers prove that the HydroPerfection lives up to its promises.
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Express Water ROALK5D 10-Stage Reverse Osmosis Filtration System with Remineralization Filter

The Good

Express Water ROALK5D Filter Unit

Express Water headquarters are based in southern California. The company has been in the water filtration industries for more than 25 years already. All Express Water products are backed and supported by a professional technical support also based in the US.

Express Water ROALK5D reverse osmosis system is the only 10-stage filtration unit we’ve come across. 99% removal of water contaminants is what the manufacturer claims on their website. All parts are 100% lead free. Additional stages add essential minerals such as calcium, magnesium, potassium and sodium benefiting your health.

Labeled quick connections and color coordinated caps support you in assembling the system yourself – no need to hire a professional plumber. Labeled housings make filter replacements straightforward.

In a recent test from April 2017 the ROALK5D was able to reduce the total dissolved solids from 245 ppm to 24 ppm. The test shows that the unit not only works efficiently, but also effectively. Installing it under your sink and using it to filter your tap water does not only benefit your health, it’s also cheaper to buy filters once a year than to buy bottled water year round.

The not so Good

4 to 5 gallons of water are wasted for every 1 gallon of pure water. Adding a permeate pump could help.

Bottom Line

We can recommend the Express Water ROALK5D 10-stage ro water filter system to anybody living in an area that suffers from bad water quality with a good conscience. Tests have shown that the system works efficiently and effectively and comes at a reasonable price.
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APEC Reverse Osmosis Reviews: Essence ROES-PH75 Alkaline Mineral 6-Stage System

The Good

APEC Essence ROES-PH75

The APEC Essence ROES-PH75 reverse osmosis system shares the same features as the Essence ROES-50 with one exception: Instead of 5 filtration stages, the Essence ROES-PH75 features 6 stages with one additional stage adding calcium carbonate to the filtered water in order to balance pH-levels and improve alkalinity. And as we are already used to, the ROES-PH75 also gets assembled in the United States to guarantee the safety of your health.

APEC uses US-made food-grade calcium carbonate from trusted sources only. The 75 GPD system removes up to 99% of water contaminants providing crystal clear drinking water to you and your family.

In order to install the system under your sink, one simply has to follow the given instructions. Tubes, faucet, drain saddle, adapters and Teflon tape are all color coded, which makes the process a lot easier. YouTube videos are also available. Make sure to have the following tools at hand, before you begin with the first installation step:

  • Drill
  • Adjustable Wrench
  • Screw Driver

Be careful to not start using the water right away. Follow the manual which will instruct you on how many gallons of water need to flow through the system to flush it, before the water can be consumed.

Bottom Line

As far as our experience goes there is not much to criticized about the APEC Essence ROES-PH75 Alkaline Mineral 6-Stage System. So instead let us give credit where it is due: This system comes at a quite competitive price, does exactly what it is supposed to do and is backed up by more than 400 amazon customer reviews.
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Cheap Reverse Osmosis System: Ecosoft Premium 5-Stage

The Good

Ecosoft Premium 5-Stage RO System

If you are on the hunt for a cheap ro system, the Ecosoft Premium 5-Stage water filter might be just the right choice for you.

Ecosoft Water Professionals was established in 1991 and is now based in the Ukraine and Germany. Over the last decade the enterprise has become one of the leading players for water purification technology production in Europe. Ecosoft is best known for their unbeatable customer service that will help you out, if you experience any problems installing one of their reverse osmosis systems. To guarantee trouble-free operation, all Ecosoft systems are put through a quality test before being sent to a customer. Also filter material is BPA-free to protect your health.

The Ecosoft Premium 5-Stage ro system utilizes a US made and NSF certified Dow reverse osmosis membrane that removes up to 99% of water contaminants, such as lead, fluoride, copper and a large range of microorganisms. At the same time calcium and magnesium and other healthy minerals are kept in the water. The unit provides you with pure H2O that saves you from buying bottled water, which oftentimes can contain plasticizers and other harmful substances.

The system comes with a Chrome faucet, a 3.2-gallon water tank and additional installation hardware. All of that and the system itself are backed up by a 30-day money back guarantee in case you are not satisfied, a 1-year full warranty and a 5-year manufacturer warranty.

A recent test on a freshly installed Ecosoft Premium water filter unit has shown that TDS are reduced from 250ppm to as low as 5ppm. We also want to point out that installation instructions are straightforward and can be followed by any non-professional.

Bottom Line

The Ecosoft Premium might not be the best ro system for home use. But at this point of time we haven’t really determined any negative aspects about this product. It is one of the cheapest ro systems and priced at around $150, which is almost unbeatable.
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More Reverse Osmosis Water Filter System Reviews
If you still have not found what you are looking for, more detailed product reviews can be found here:

The following guide addresses frequently asked questions and provides detailed information regarding ro technology.

What is Reverse Osmosis Water

drinking glassBefore we discuss more complicated topics in our buying guide, let us begin with answering the simple question, what reverse osmosis water is.

Just to recap: Osmosis describes the natural flow of a liquid or gas, for example water, through a semipermeable membrane from a region of low solute concentration to a region of high solute concentration. For illustration purposes:

Let’s say we have a tank with liquid solutions in it, solution 1 and 2 separated by a semipermeable membrane – semipermeable meaning that not all, but only certain substances, in our case water, can pass through it. Solution 1 has 100g of common salt dissolved in it. Solution 2 has 10g of common salt dissolved in it. Water molecules will now pass through the semipermeable membrane from solution 2 to solution 1 in order to balance the salt concentration in both liquids.

Reverse Osmosis describes the movement of molecules into the opposite direction. This can be achieved by applying external pressure on the high solute concentration side. What remains is purified water with little to no dissolved salt on one side of the membrane and water with a high salt concentration on the other.

If you want to learn more about the reverse osmosis process itself, read this blog post.

Now, what is reverse osmosis (drinking) water? As the name suggests, ro water is water that was purified by utilizing a reverse osmosis filtration system. Depending on the feed water and the system itself, the filtered water may or may not be safe for human consumption. Some water that comes out of an ro system might be suitable for gardening or to fill your fish tank, but that’s about it.

Where to Buy Reverse Osmosis Water

Where you can buy reverse osmosis water depends on the intended use. As indicated above, if you intend to fill your fish tank, it’s probably best to go to your local aquatics retailer or some LFS. 1 gallon might cost about 30 cents depending on how much water you need of course and how often you’d have to go and pick it up.

shopping cart iconIf you are looking for bottled drinking water, just go to Walmart or any other supermarket. They will have a broad range of brands selling mostly tap water purified by reverse osmosis. Two examples are Aquafina and Dasani.

If your demand for filtered water is quite high, it’s always an option to install a purification system under your kitchen sink and do the filtration yourself. It is also more convenient than driving to town each time you are thirsty and run out of water and at the same time you protect the environment since you are using less plastic.

What is a Reverse Osmosis System

You now know what osmosis and reverse osmosis is. But what exactly is an ro system and how does it work?

To reverse the natural flow of water molecules through a semipermeable membrane you need to apply external pressure. This is what a residential ro system does. It utilizes the pressure in the water system of your house to push the molecules through the membrane, where it leaves up to 99 percent of all contaminants behind.

But the membrane at the heart of the purification unit is not the only filtration stage water has to pass through. All residential ro filtration systems that we know of have integrated at least 1 additional pre-filter and most of the times 1 additional post-filter stage. These stages filter out rust, sand, dirt and other coarse impurities, remove taste and odors or even add minerals like magnesium back into the water to increase its pH-value. So you see, an ro system is much more than just a membrane and a tank.

How to Install an RO Filter Unit

A picture says more than a thousand words, and a video says even more than that. If you want to find out how to install your filtration system, take a look here:

What does Reverse Osmosis Remove from Water

What does reverse osmosis remove from water? This is a question that gets asked quite often. And again the correct answer would be, that it depends. It depends on the model you purchased and on how many and which filtration stages it has and how good they work, it depends on the age and condition of filters and membrane and whether or not they are clogged up. It even depends on the feed water running into the system, since no filter can remove what isn’t already there yet and if contamination of your water is really bad, it’s simply harder to remove all pollutants.

But there are also some substances an ro system cannot remove at all no matter how good works or how good its condition is. Therefore in the next section you will find a list of substances that can and cannot be removed, if secondary issues don’t play a role:

Substances that can be removed

Ions and Metals:

  • Arsenic, Aluminum
  • Barium
  • Cadmium, Calcium, Chloride, Chromium, Copper
  • Fluoride
  • Iron
  • Lead
  • Magnesium, Manganese, Mercury
  • Nitrate
  • Potassium
  • Radium
  • Selenium, Silver, Sodium, Sulfate
  • Zinc


  • Asbestos
  • Protozoan cysts
  • Cryptosporidium


  • Endrin
  • Heptachlor
  • Lindane
  • Pentachlorophenol

Substances that cannot be removed

Dissolved Gases:

  • Hydrogen sulfide

other Pesticides and Solvents and Volatile Organic Chemicals (VOCs)

spraying pesticides on field

Since most ro purifiers feature additional filtration stages, here is a list of contaminants activated carbon (AC) filters, which are commonly used in conjunction with an ro membrane, help to remove:

Substances AC filters can remove

Ions and Metals:

  • Chlorine
  • Radon

Organic Chemicals:

  • Benzen1
  • Carbon tetrachloride
  • Dichlorobenzene
  • Toluene, Trichloroethylene, Total Trihalomethanes (THMs)


  • 1,2,4-trichlorobenzene
  • 2,4-D, Atrazine


Does Reverse Osmosis Remove Fluoride?

An ro system’s ability to remove fluoride from water was part of the experiment conducted by Bruce Dvorak and Sharon Skipton from the University of Nebraska. The experiment has shown that ro systems are able to remove fluoride from water. Unfortunately Dvorak and Skipton did not specify to what extent (percentage) fluoride gets removed. But they also pointed out that a system’s ability to remove contaminants always depends on its condition.

How to Remove Fluoride from Water
If you want to remove fluoride from your water at home but don’t know how, this will help:

Does Reverse Osmosis Remove Chlorine?

Chlorine is a gas and so small that it can simply pass through a semipermeable membrane. If you still want to remove it from your water, make sure to buy an ro system that features activated carbon filters. The experiment has shown that AC filters are able to eliminate chlorine

Does Reverse Osmosis Remove Sodium (Salt)?

To put it in a nutshell, yes it does. Compared to other substances, sodium gets removed to an exceptional high degree, too.

Does Reverse Osmosis Remove Lead?

Again, the experiment has shown that a reverse osmosis filtration unit is able to remove lead during the purification process.

How to Remove Lead from Water
If you need help with removing lead from your water, read this:

Does Reverse Osmosis Remove Bacteria?

RO systems remove fluoride, chlorine, sodium, lead and so much more, but can it also remove bacteria? Yes, it can! Obviously there are many different bacterial strains that can be found in our water, but since bacteria is much larger than chlorine or fluoride, it gets easily rejected by an ro membrane and has no chance of passing through the other side.

Does Reverse Osmosis Remove Iron?

It does, although reverse osmosis is not intended to remove iron at high concentrations. This is because the ro membrane would clog in a second when used on raw well water. Pre-treated well water can be processed with a reverse osmosis system, though.

How to Remove Iron from Well Water
If you need help with removing iron from well water, read this:

How Much Water is Wasted with Reverse Osmosis

The ro filtration process wastes a lot of water. To be precise, about 80% of it on average goes to the drain and can’t be drunken. It’s possible to repurpose the water and use it for gardening or cleaning, but it holds an even higher concentration of impurities and could therefore be harmful to your health – make sure to not drink it!

Why does the Process Waste that much Water?

We already know that reverse osmosis depends on external pressure. The pressure “forces” water molecules to pass through the semipermeable membrane. The molecules leave all impurities behind and come out on the other side of the membrane. But lead, fluoride and pesticides don’t just vanish. They are flushed out of the system via a second water line usually connected to the kitchen drain. This is how water is wasted.

The good news is that in general, the higher the pressure, the more molecules will pass through the membrane and wasting decreases. If the pressure in your home is not high enough, you can purchase a permeate pump, which increases pressure and reduces wastewater by up to eighty percent. The Home Master TMAFC-ERP is a great example for a system that has a permeate pump included in the scope of delivery.

Is Reverse Osmosis Water Safe to Drink and Healthy?

Many people ask if ro water is safe and benefits someone’s health or if it’s bad for the human organism and should be avoided.

healthy iconWhy RO Water is Good for you

  1. First and foremost, ro water is free from contaminants that pollute the public water supply. Even in the US water quality has deteriorated in the last decades. Soil pollution, increased use of pharmaceuticals and waste disposal are only three of many reasons, why the quality is not as high as it used to be. Reverse osmosis systems remove harmful contaminants including bacteria and most viruses.
  2. RO water tastes much better. It is far more likely that you drink more water, if it was filtered before. We all know how important it is to stay hydrated.
  3. Having a purification system installed in your home, there’s no need to buy bottled water anymore. It’s an easy way to save money and all upfront costs will be covered soon.
  4. Buying no more bottled water also means using less plastic bottles. If you rely 100% on filtered tap water, you can reduce environmental pollution significantly.
  5. Reverse osmosis is an established technology that has been used in the food industry for years. Many bottled water companies also use the technology to process their water.
  6. RO is 100% mechanical meaning no artificial chemicals are used during the process. If no additional chemicals are being used, they cannot harm you.
  7. Do you love to surprise your friends with a delicious cocktail on the weekend? Have you ever been annoyed, because your ice cubes where all milky? Ice cubes made out of purified water are crystal clear, since all gas and contaminants are removed. In order to make the perfect cocktail, use filtered water for your ice cubes from now on.

Also check out the following infographic summarizing “The 7 Benefits Of Residential RO Water Purifiers”:

The 7 Benefits Of Residential RO Water PurifiersWant to share this image on your site? Just copy and paste the embed code below:

stethoscope iconWhy RO Water is “Bad” for your Health

  1. There is one aspect about ro filtered water that we should not overlook. It’s free from harmful substances – which is great – but it also lacks important minerals and ions that are lost during filtration. Calcium is one of these minerals and our daily requirement for it is covered by drinking water by up to 20%. The remaining 80% are obtained from food.
    If you want to make sure to compensate those 20%, simply add calcium and other minerals back into the water after filtration by using a standard electrolyte blend for example. Some systems like the Express Water ROALK5D already have a built-in remineralization stage that supplies calcium, magnesium, potassium and sodium.
Remineralization 101
Want to learn more? Check out our full guide on how to add minerals back into ro water!

Reverse Osmosis vs. Water Softener

People visit our website and ask, “wouldn’t it be better to purchase a water softener instead of a reverse osmosis filtration system?” This is a tough question to answer, not because ro systems and water softeners are so similar to each other, but because they are completely different and fulfill different purposes.

An ro purification unit removes contaminants from water with the goal to make it safe for human consumption. Even sea water and wastewater can be recycled this way. Softeners are there to simply reduce the hardness of water by ion exchange.

Hard Water

Water is defined as ‘hard’, if it contains large amounts of calcium and magnesium ions and sometimes other minerals. Hardness is measured in ‘grains per gallon’ (gpg, 1 grain = 64.8mg of calcium/magnesium ions) or mg/l. The values for soft, slightly hard and hard water are:

mg/lgpgHardness Degree
17.1-601.0-3.5slightly hard
60-1203.5-7.0moderately hard
>180>10.5very hard

Two main problems are caused by hard water. First of all, it causes scaling in the inside of pipes, heaters, coffee makers, washing machines etc. The second big problem, which results from the first, is that clogged pipes reduce water flow and in extreme cases a pipe can block completely. What happens next is your washing breaks down, your coffee maker starts leaking and your heater needs replacement.

In order to prevent your household appliances from getting damaged and reduce water hardness, you can take different precautions:
chemical laundry softener

  1. Filter your water using a distillator,
  2. manually add a chemical softener to your water,
  3. filter your water using a reverse osmosis system or
  4. run it through a water softener.

A commercial distillator needs some time and a lot of energy to heat enough water for your household. It is an effective process, but not very economical.

Manually added chemicals soften water in small batches, but also make it undrinkable. They are unhandy and further wear out clothes and are not always good for the environment. This leaves us with using an ro system or running the water through a softener.

How does a water softener work?

Water softeners remove positively charged ions (usually calcium and magnesium ions), which are dissolved in water and cause ‘hardness’, and exchange them with other ions such as sodium or potassium ions. Thereby, a softener operates in automatic, semi-automatic or manual mode. Calcium and magnesium ions that are removed from the water are stored in a tank and flushed down the drain from time to time.

The reason why softeners are quite popular is that they are oftentimes cheaper than multistage ro units and don’t require much maintenance. But they fulfill a different purpose than a purification system does.

If you want to filter out impurities and enjoy great tasting drinking water, softeners aren’t sufficient. They protect the piping system in your house more than they protect you. In this case, the safest and most ergonomic solution definitely is a reverse osmosis system. However, if you only want to reduce water hardness and extend the lifespan of your washing machine, a water softener is also an option.

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