RO Membranes

Need Residential RO Filters?
Know your reverse osmosis system name or RO filter part numbers? Find your replacement residential reverse osmosis filters or shop by brand.
Reverse osmosis is one of the most common and effective water treatment systems. The primary filtering media in these systems is an RO membrane. Depending on your application, we offer different reverse osmosis membranes suited for sea water desalination, brackish water, and high flow commercial applications. If you need help finding your RO membrane, let us know.
Learn More About Reverse Osmosis Membranes
RO MembraneReverse osmosis (RO) definition: A purification technology that uses a semipermeable membrane to reduce dissolved or suspended water contaminants.


Tap Water RO MembranesTap Water RO Membranes - Commerical TFC Tap Water Reverse Osmosis Membranes
RO membranes for small commercial systems purifying less than one gallon per minute of RO water.
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Brackish Water RO MembranesBrackish Water RO Membranes for Industrial & Commerical Brackish Reverse Osmosis Systems
RO membranes for light industrial systems that need high rejection and where operating pressures as low as 200 psig are desired.
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Low Energy RO MembranesLow Energy RO Membranes - Low Pressure Reverse Osmosis Membranes
Most productive, lowest pressure RO membranes for commercial application for high purity water.
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High Flow Rate RO MembranesHigh Flow Rate RO Membranes from Filmtec
These high flow reverse osmosis membranes are for hospitals, dialysis clinics, and other medical applications. High flow reverse osmosis membranes feature superior permeate flow and salt rejection.
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Nano FiltrationNano RO Membranes - Nano Reverse Osmosis Membranes
These reverse osmosis membrane elements remove organics with molecular weights greater than 300 amu while passing monovalent salts.
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Sea Water RO MembranesSea Water RO Membranes
Seawater reverse osmosis membrane elements for high productivity. Excellent salt rejection for sea-based and land-based desalinators.
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Residential RO MembranesResidential RO Membranes
Smaller membranes with lower production rates for residential and undersink RO systems.
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Membrane ChemicalsMembrane Chemicals
Membrane chemicals are compatible with all brands and types of RO, NF and UF membranes and provide antiscaling and antifouling capabilities.
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How Does an RO Membrane Work?

How does an RO membrane work?

Reverse osmosis water filtration systems work by using high pressure to force water through a semipermeable reverse osmosis membrane element. RO membranes are made of a thick polyamide film that contains tiny pores through which water can flow. RO membrane element pore sizes can vary from 0.1 to 5,000 nanometers (nm) depending on application. The pores in the RO membrane are small enough to restrict organic compounds such as minerals and salt, but allow water molecules to pass through. Reverse osmosis membranes are also porous and restrictive enough to filter out disease causing pathogens and bacteria from water.

About RO membrane life expectancy

Typically RO membranes have an estimated life expectancy of about 2 years. There are many variables that come into play in determining a RO membrane’s life expectancy, such as feed water quality and amount of use. There are methods for cleaning a reverse osmosis membrane but often are not cost effective for residential RO systems.
About RO Membrane Life Expectancy

About RO Membrane Fouling

About RO membrane fouling

All reverse osmosis membranes lose their performance and will foul over time. One of the primary reasons for RO membrane fouling is because of substances that deposit on the reverse osmosis membrane surface. The RO membrane elements can become fouled by suspended solids, microorganisms, and build-up from mineral scale. Examples of suspended solids often found in feed water can include oil, silica, clay, iron, sulfur and acids. To increase the life of your RO membrane, reduce most of these suspended solids before the water enters the membrane. Use a 5 micron carbon prefilter cartridge before the reverse osmosis membrane. This will help, but may not completely remove all suspended solids that cause a RO membrane to foul.