reverse osmosis water filter

Reverse Osmosis Water Filter: 5 Things to Know Before Purchasing

Drinking water is supposed to be good for you. It’s not always, unfortunately, depending on where you’re getting your water from.

There can be over 2000 different known contaminants in your drinking water. Some of the most common drinking water contaminants can be unbelievably detrimental to your health. These include uranium and arsenic, among others.

This is worrisome, considering that nearly 77 million Americans got water from drinking water systems that violated federal drinking water protections in 2015.  

If you’re drinking tap water, you should be using a water filtration system. Reverse osmosis water filtration is one of the most rugged and dependable filtration techniques you can find.

Here are 5 things you need to know before buying a reverse osmosis water filter.

5 Things To Know Before Buying A Reverse Osmosis Water Filter

Reverse osmosis water filters use an array of scientific principles to ensure your drinking water is as safe as possible. It’s a fascinating process when you delve into it and understand its intricacies.

We’re going to help you understand how reverse osmosis water systems work.

What Is Osmosis?

Have you ever heard the phrase “learning by osmosis”? Perhaps used as a justification to defend someone sleeping through class or browsing the Internet during a lecture?

Osmosis is the process of passing a solvent from a lower-concentration solution to a higher-concentration solution. In this instance, the solvent is water. The water is passed through a semipermeable membrane between the two solutions.

This semipermeable membrane traps the contaminants while allowing the solvent to pass. The process concludes when the two solutions are at equal concentration. This process is known as passive transport, as it requires no additional energy to work.

How Reverse Osmosis Works

Reverse osmosis requires energy expenditure to move the solvent to reverse the osmosis process. Pressure is exerted to allow water to move from high-concentration solutions to low.

Generally speaking, contaminant molecules tend to be larger than water molecules. Because of this fact, only water molecules are able to pass through the semipermeable membrane. Applying pressure to the water allows it to pass through the reverse osmosis filter, leaving contaminants behind.

The Steps Of Reverse Osmosis Process

The reverse osmosis water filtration process involves four main steps.


In the first stage of reverse osmosis, pressurized water is passed through a particle filter. This removes common contaminants such as sand, salt, and sediment.

Then the water’s passed through an active carbon filter. This removes finer contaminants such as mercury, copper, chlorine, and pesticides. These are the two steps of the pre-filtration stage.

Reverse Osmosis

After the pre-filtration stage, the water is passed through a semipermeable membrane. The membrane filters out the smallest particles so that only the water is able to pass through.

To put things into perspective, a human hair is roughly 100 microns in diameter. The spaces of a semipermeable membrane are 1 micron wide, by comparison.


After the water’s been filtered, the contaminants are flushed away. The purified water is then moved to a storage container that will provide clean water to your household.


Before the water is delivered back to your faucets, it goes through one final filtration stage. This improves the taste and quality of your water for drinking and other common household uses.

Common Components Of Reverse Osmosis Systems

While different manufacturers have their own unique designs, here’s a basic template of most reverse osmosis water systems.

Cold Water Line Valve

The cold water line valve attaches to your municipal cold water supply line. This attaches to an inlet valve on your reverse osmosis filter, which serves as its water source.

Automatic Shutoff Valve

An automatic shutoff valve helps the reverse osmosis water system conserve water. When a storage tank is full, it stops the shutoff valve stops further water from entering the membrane, which stops water production. 

This also prevents water from going into the drain. 

When water is withdrawn from the storage tanks, it reduces the pressure in the tank. This allows the automatic shutoff valve to open. This lets the water resume collecting in the storage tank or going down the wastewater drain. 

Check Valve 

The check valve is found at the outlet end of the reverse osmosis membrane housing. This prevents backward flow or product water from the reverse osmosis storage tank. This backward flow could damage the reverse osmosis membrane.

Reverse Osmosis Filters’ Effectiveness

Reverse osmosis water filters are almost foolproof. They remove the lion’s share of common contaminants found in most drinking water.

Generally speaking, reverse osmosis is effective at removing:

  • 92 – 96% Arsenic
  • 95 – 98% Barium
  • 95 – 98% Cadmium
  • 94 – 98% Calcium
  • 85 – 92% Chlorine
  • 84 – 92% Cyanide
  • 85 – 92% Fluoride
  • 94 – 98% Iron
  • 95 – 98% Lead

Reverse Osmosis Systems Require No Upkeep

A water filtration system is only as good as its components. Other water filtration solutions, such as faucet or refrigerator filters, require continual maintenance to make sure they’re doing their job.

That’s not even to mention the fact that many commercial water filtration systems aren’t fine enough to catch a lot of common contaminants.

A reverse osmosis water filter ensures that you and your family will have the cleanest, safest, purest water for drinking and washing for years to come!

Are You Ready For A Water Filter System For Your Home?

It’s impossible to put a price tag on peace of mind! Knowing you and your loved ones are getting clean, pure drinking water helps put your mind at east so you can focus on more important things.

Whether you’re looking for a reverse osmosis water filter or filters for your shower, we have everything you need to make sure your water’s clean and safe!

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