Osmosis is when water passes through a membrane (a sheetlike boundary) and other materials cannot pass through or can only pass through in lower amounts. Osmosis happens in all living things naturally, because all life needs water. When water is sepa

Osmosis is when water passes through a membrane (a sheetlike boundary) and other materials cannot pass through or can only pass through in lower amounts. Osmosis happens in all living things naturally, because all life needs water. When water is separated by a membrane, pressure is created by the amount of foreign materials in the water. The pressure will push water from the side of the membrane with less foreign materials until there is a balance between water and foreign particles is equal on both sides.With some clever science and engineering, osmosis can be made to work for us. We just add pressure, from your home&#x2019;s water pressure, to the side with more foreign material. The extra pressure can stop or reverse this flow. This means that water will now only flow away from the foreign material. This is Reverse Osmosis.

What is Reverse Osmosis?

In Reverse Osmosis we apply extra pressure to the water to push it through thousands and thousands of membrane layers. The extra pressure stops foreign materials from drawing water to them. The result is these foreign materials are left behind and th

In Reverse Osmosis we apply extra pressure to the water to push it through thousands and thousands of membrane layers. The extra pressure stops foreign materials from drawing water to them. The result is these foreign materials are left behind and the only thing that can come through the membrane layers is pure water.The Reverse Osmosis Membrane is only one stage of our RO Systems; it&#x2019;s the 4th stage. The 1st stage is a Sediment filter which helps filter things like dirt, sand, dust, and rust. The 2nd and 3rd stages are Carbon Filters which filter things like chlorine, volatile organic chemicals, and odor-causing compounds.These early stages help extend the life of the Reverse Osmosis Membrane by taking care of many larger coarse contaminants which could damage it. But they do not deal well with Total Dissolved Solids (TDS) which are the most difficult to remove. Up to 99.99% of TDS are removed by the RO Membrane as well as other difficult contaminants like lead, arsenic, chromium, and radium. The Membrane is where most of the purification takes place.The 5th stage is a granular-activated carbon filter which does a final pass on your water right before you drink it. This last stage is focused on removing any possible taste or odor in your water. It&#x2019;s the combination of these stages that&#x2019;s helped countless customers have water purer than bottled water straight from their faucet.

How Does Reverse Osmosis Work?

To learn more about the Reverse Osmosis products offered by Express Water, please visit our Reverse Osmosis Systems page.

To learn more about the Reverse Osmosis products offered by Express Water, please visit our <a href="https://www.expresswater.com/pages/plp-rosystem" title="plp-rosystem" style=" text-decoration: underline;">Reverse Osmosis Systems</a> page.

Express Water Reverse Osmosis Filters

Express Water

Reverse Osmosis

Total Dissolved Solids (TDS): What are they?  Total Dissolved Solids (TDS) are all organic and inorganic contaminants that have been dissolved into water. These contaminants are gathered from everything water comes into contact with before it finds i

Contaminants: What contaminants are reduced by Reverse Osmosis?

Does Reverse Osmosis remove Parasites, Bacteria, Cysts, and Cryptosporidium?

What happens to filtered impurities?

Drinking Water Contaminants

Water Pressure: How important is water pressure to an RO System?

Iron: Will iron hurt an RO System?

Water Differences and Dissolved Solids: How is RO Water different from tap water? How will I know the RO System is removing Dissolved Solids from my tap water?

Lifespan: How long does the system last? How long does the tank last?

My Home: How do I know this system will work in my home?

System Life: How long does the system last? How long does the tank last?

Tank Capacity: How much water can the Water Storage Tank hold?

Express Water Reverse Osmosis Systems

Water Softeners: Does a water softener treat my drinking water?

Water Softeners: Will a water softener harm a Reverse Osmosis System?

Water Softeners: Will an RO System soften water?

Water Softeners: How do water softeners work with the RO System?

Water Softeners & Reverse Osmosis Systems

Do RO Systems send water down the drain?

What is the discharge rate?

What is the ratio of wastewater to pure water produced by an Express Water RO System?  Your water pressure, incoming water quality, and water temperature will affect your RO System’s discharge rate.

Can wastewater be saved and used?

RO Waste Water & Wastewater Discharge

Filter Changes: Is it necessary to change the filters every six months?

Flow Restrictor: Is it necessary to change the Flow Restrictor when I change the RO Membrane?

Filter Changes: Is it necessary to change the filters every six month?

Filter Upgrades: Can I add additional filters to my current system?

Refrigerator and Ice Makers: Can I connect this system to a refrigerator or icemaker?

System Upgrades: Can I change my 50 GPD (Gallons Per Day) system to 100 GDP? If so, how?

Water Filter Upgrades

Water Filter User Manuals

Mounting Locations: Does the RO System have to be under the kitchen sink?  No, the RO System can be mounted in a cabinet to either side of the kitchen sink or even mounted remotely in a garage or basement.

Dimensions: What are the dimensions of an Express Water RO System?

Line Length Maximum: How far can a line run from the RO System?

Copper Tubing: Why not use copper tubing with an RO System?

Install Locations: Can I install this system in the basement? Can I install somewhere other than under my sink?

Water Filter User Manuals & Installation FAQs

Shipping: When will I get my package?

Returns: How do returns work?

Warranty: How does the warranty work?

Canceling an Order: How do I cancel an order?

Technical Difficulties: I’m having trouble using the site or getting through checkout, what should I do?

Ordering and Website Support