RO membranes are key components of reverse osmosis filters, responsible for precise water purification and the proper operation of the entire RO system. In this category you will find membranes for domestic, commercial and selected industrial reverse osmosis installations, available in different GPD capacities. Choose the right RO membrane for your filter to maintain effective filtration, good water flow and high drinking water quality.
RO filter selection wizard
Choose the right reverse osmosis filter in 30 seconds
Answer a few short questions and we will show you the best-matched RO systems.
CALCULATE BEFORE YOU CHOOSE
Useful calculators
Check the key values before choosing a solution.
01Convert GPD to litresCheck the approximate daily output of a reverse-osmosis membrane.Open calculatorCollapse calculator→
Convert GPD to litres
RO membrane output converter (GPD)
Convert GPD to litres and view a simplified temperature and feed-pressure correction.
Supreme 100 GPD is a membrane for reverse osmosis systems for drinking water and aquarium applications. In standard size, it fits most RO membrane housings. It removes up to 99.9% of dissolved organic and inorganic contaminants, heavy metals, and selected bacteria and viruses (not smaller than 0.001 microns). The product has an individual serial number.
Pentair MERLIN TLC-350 (FRO360-M) osmotic membrane for reverse osmosis RO systems. Designed for domestic and semi-industrial applications (including kindergartens, offices, laboratories). It retains 96% - 99% of dissolved organic and inorganic contaminants, heavy metals, and some bacteria and viruses >= 0.001 µm. Performance: 1300 l/24 h .
Filmtec 75 GPD is an osmotic membrane for reverse osmosis systems, providing very precise water purification. It stops most dissolved organic and inorganic contaminants, including bacteria, viruses, chemical compounds, and heavy metals. It reduces salt content, helping to lower water hardness. It is suitable for drinking water and aquarium applications.
Vontron 75 GPD reverse osmosis membrane for reverse osmosis systems. It purifies water from most dissolved organic and inorganic contaminants, including bacteria, viruses, chemicals, and heavy metals. It helps reduce the amount of salts in the water, resulting in a noticeable reduction in hardness. Suitable for drinking water and aquarium applications. It is also recommended to replace the restrictor (flow limiter) when replacing.
Vontron 300 GPD is an osmotic membrane for reverse osmosis filters, responsible for the most precise stage of water treatment. It retains most dissolved organic and inorganic contaminants, including heavy metals, chemical compounds, and microorganisms, and also reduces water hardness. It is suitable for drinking water and aquarium applications. For longer lifespan, use efficient pre-filters.
VONTRON ULP21-4040 Osmotic Membrane (4040) for RO systems in car washes and industrial applications. The ultra-low pressure series ensures high performance even at lower feed pressures. For desalination of surface and groundwater with a concentration below 2000 ppm. Salt rejection up to 99.5%, large filtration area of 7.9 m2. Certifications: NSF/ANSI 58, FDA, PZH.
TLC-50 Pentair 50 GPD is a reverse osmosis membrane filter designed for very precise water purification. It retains most dissolved organic and inorganic contaminants, including bacteria, viruses, heavy metals, and chemical compounds. It also reduces water hardness. For longer lifespan, pre-filters are recommended.
TLC-75 Pentair 75 GPD is an osmotic membrane for reverse osmosis filters. It purifies water very thoroughly, retaining most dissolved organic and inorganic contaminants, as well as bacteria and viruses. It helps reduce hardness and obtain water suitable for drinking and aquarium applications. For longer lifespan, use pre-filters.
AC-OM-100 Osmotic Membrane 100 GPD for reverse osmosis (R.O.) systems. The TFC semi-permeable membrane in the form of a spiral coil is a key element of molecular filtration, limiting the penetration of organic and inorganic contaminants as well as dissolved salts. Performance up to 100 GPD (approx. 370 l/24 h) , operating range 2-42°C and 2.8-6 bar .
RO-50S Aquaphor MORION is a reverse osmosis membrane for RO series systems. It helps remove most contaminants present in tap water, including bacteria, viruses, and cysts, and reduces excessive water hardness. Designed for RO-101S Morion M and RO-101S Morion B filters (versions without a bottom drain).
AC-OM-300 is an TFC osmotic membrane with a performance of up to 300 GPD (up to 1134 l/24h). It is a key component of the reverse osmosis system, creating a barrier against organic and inorganic contaminants, dissolved solids, and heavy metals, among others. Designed to operate at a pressure of 2.8-6 bar and a temperature of 2-42°C. Chlorine tolerance: 0 ppm.
RO 400 GPD osmotic membrane for RO400 systems. Thanks to its very fine pores, it effectively reduces dissolved organic and inorganic contaminants (including heavy metals) and helps limit certain bacteria and viruses. Contaminants are discharged into the sewage system, while high-purity water for drinking and cooking is supplied to the installation. Brand shipped randomly: Canature or Vontron.
Filmtec 100 GPD is an osmotic membrane for reverse osmosis systems. It purifies water by retaining most dissolved organic and inorganic contaminants, as well as bacteria, viruses, heavy metals, and chemical compounds. It reduces salt compounds, which leads to a significant decrease in water hardness. With proper protection from pre-filters, it can operate for a long time.
TFC-50F Aquafilter is an osmotic membrane for reverse osmosis filters. It is a key element in precise water purification, retaining dissolved organic and inorganic contaminants, as well as bacteria, viruses, chemical compounds, and heavy metals. It also removes dissolved salts, resulting in a significant reduction in hardness. It is suitable for drinking water and aquarium applications.
TFC-75F Aquafilter is an osmotic membrane for reverse osmosis systems. It provides very precise water purification by retaining most dissolved organic and inorganic contaminants, including bacteria and viruses. It also reduces salt content, which results in a significant decrease in hardness. It is suitable for drinking water and aquarium applications. Pre-filters are required for long-term operation.
TFC-100F Aquafilter is an osmotic membrane for reverse osmosis systems. It retains most dissolved organic and inorganic contaminants, including heavy metals, chemical compounds, and microorganisms, ensuring very precise filtration. It reduces the amount of salts and significantly lowers water hardness. Used for drinking water and in aquaristics. For longer lifespan, it requires proper pre-filters.
TFC-300F Aquafilter is an osmotic membrane for reverse osmosis systems. It purifies water from most dissolved organic and inorganic contaminants, including heavy metals, chemical compounds, and microorganisms. It also helps to reduce salt content and significantly lowers hardness, providing water suitable for drinking and aquarium applications. For longer lifespan, use pre-filters.
Vontron 50 GPD is an osmotic membrane for reverse osmosis filters. It retains most dissolved organic and inorganic contaminants, bacteria, viruses, heavy metals, and chemical compounds, providing water suitable for drinking and aquaristics. It also reduces the amount of salt in the water, resulting in a noticeable reduction in hardness. For longer lifespan, use pre-filters.
Vontron 100 GPD is an osmotic membrane for reverse osmosis systems, providing very precise water purification. It retains most dissolved organic and inorganic contaminants, as well as bacteria, viruses, chemical compounds, and heavy metals. It reduces the salt content in water, which results in a significant decrease in hardness. It is suitable for drinking water and aquaristics.
TLC-100 Pentair osmotic membrane for reverse osmosis systems. It provides very precise water purification by retaining most dissolved organic and inorganic contaminants, bacteria, and viruses, while reducing the salt compounds responsible for hardness. It is suitable for drinking water and aquarium applications. For longer lifespan, use pre-filters and replace the flow restrictor when changing the membrane.
HelixPRO 100 GPD is an osmotic membrane for reverse osmosis filters. It provides very precise purification of water from dissolved organic and inorganic contaminants, including bacteria, viruses, chemical compounds, and heavy metals. It reduces salt content, which results in a significant decrease in hardness. It is suitable for drinking water and aquaristics. It is recommended to replace the restrictor when replacing the membrane.
RO-50 Aquaphor MORION is a reverse osmosis membrane for RO series Morion systems. It provides very precise water purification, retaining up to 99.9% of dissolved organic and inorganic contaminants, as well as bacteria, viruses, chemicals, and heavy metals. Designed for RO-101S Morion M and RO-101S Morion B filters.
AC-OM-75 75 GPD is a TFC (thin-film composite) reverse osmosis membrane for molecular filtration systems. It is a key element in water purification, reducing, among others, chlorine (>97%), heavy metals (>97%), bacteria (>99%), hardness Ca/Mg (>96%), and organic compounds. Efficiency up to 75 GPD (approx. 280 l/24 h) , operating range 2-42°C and 2.8-6 bar .
An osmotic membrane is the heart of every reverse osmosis system. It is responsible for precisely separating water molecules from many unwanted substances, supporting effective filtration and improving the quality of utility and drinking water. In practice, choosing the right model affects not only water purity, but also the performance of the entire system and how well the installation matches actual demand.
This category includes osmotic membranes for reverse osmosis systems with various capacities, from solutions for smaller households to membranes for commercial and industrial applications. These membranes are semi-permeable filtration barriers that selectively allow water molecules to pass through while retaining many contaminants, including bacteria, viruses, chlorine, heavy metals, and numerous organic and inorganic compounds. Typical filtration accuracy reaches approximately 0.0001 micron.
Osmotic membranes are selected primarily according to system capacity and water demand.
What is an osmotic membrane?
An osmotic membrane, also called a filtration membrane, is a semi-permeable barrier used in reverse osmosis filters. Its task is to selectively allow water molecules to pass through while blocking many unwanted substances. Thanks to a structure capable of eliminating contaminants larger than approximately 0.0001 micron, the membrane is the most important element responsible for the final quality of filtration.
This is exactly why RO membranes are so commonly used wherever high-quality water is needed — from household applications to more demanding specialist installations.
Key benefits of using osmotic membranes
A properly selected osmosis membrane supports effective water treatment and enhances the functionality of the entire filtration system.
Effective removal of contaminants at the molecular level.
Improved drinking water quality at home and in business.
Reduction of heavy metals, bacteria, viruses, chlorine, and many organic and inorganic compounds.
Reduction of calcium and magnesium ions, which helps limit limescale formation.
Capacity matched to different applications — from small household systems to larger commercial and industrial setups.
Versatile use in drinking water filtration, car washes, laboratories, hospitals, and selected branches of industry.
Different membrane capacities make it possible to choose a solution for home, business, or industrial applications.
Types of osmotic membranes by capacity
Osmotic membranes can be divided primarily according to their throughput, meaning the amount of purified water they are able to produce per day. This is the basic criterion for selecting a model for a specific system.
Membrane capacity
Clean water production
Typical application
50 GPD
up to 189 liters per day
Smaller households
75 GPD
up to 283 liters per day
Medium-sized homes, sufficient capacity for most family needs
100 GPD
up to 378 liters per day
Larger households or small businesses
150 GPD
up to 567 liters per day
Homes with higher water demand or small enterprises
400 GPD
up to 1500 liters per day
Larger commercial installations, small industrial plants, tankless systems
600 GPD
up to 2280 liters per day
Large industrial applications, large car washes, tankless systems
2400 GPD
up to 9074 liters per day
Large industrial plants and large car washes
Applications of osmotic membranes
RO membranes are a versatile solution and are used in many areas where stable water quality is crucial.
Drinking water purification in homes — systems with a 75 GPD membrane are especially popular.
Pharmaceutical industry — wherever high-quality water is required.
Car washes — clean water helps reduce streaks on vehicles.
Hospitals and laboratories — purified water is essential in many medical and technical processes.
Small and large industrial plants — depending on the scale of the installation and water demand.
How to choose the right osmosis membrane?
Choosing the right membrane should take several practical factors into account. The most important of these are daily water consumption, feed water quality, and system configuration.
Water demand
50 GPD or 75 GPD — usually sufficient for smaller households.
100 GPD or 150 GPD — a good choice for larger homes or small businesses.
400 GPD, 600 GPD, or 2400 GPD — solutions for larger enterprises and industrial applications.
Feed water quality
If the water is especially hard or contains a lot of contaminants, it is worth paying attention to proper membrane selection for operating conditions and to regular monitoring of the entire filtration system.
System size and configuration
The design of the installation and the amount of available installation space also matter. Spiral-wound membranes are widely used due to their high efficiency and compact size.
Tip: membrane selection should always be linked to the parameters of the entire reverse osmosis system, not just the declared capacity itself. This is important for user comfort, filtration speed, and proper system operation.
Which flow restrictor should you choose for an osmotic membrane?
The flow restrictor should be matched to the membrane capacity because it affects the balance between filtration rate and water loss.
For a 100 GPD membrane: 420 restrictor — recommended for those who want to minimize water loss. 550 restrictor — provides a faster filtration rate and may be beneficial when there is higher demand for clean water.
For a 75 GPD membrane: 350 restrictor — for those who want to minimize water consumption as much as possible. 420 restrictor — a compromise between savings and efficiency.
For a 50 GPD membrane: 350 restrictor — optimal for very small systems where minimizing water loss is important.
The membrane is responsible for the most precise filtration stage in a reverse osmosis system.
Structure of an osmotic membrane
Understanding the membrane structure helps better assess its capabilities and operating principle. It is a key component of reverse osmosis systems, responsible for high filtration efficiency.
Membrane material
TFC polyamide (Thin Film Composite) — the most commonly used material in modern membranes. A thin-film composite with a polyamide layer effectively removes a wide range of contaminants at the molecular level.
Cellulose acetate (CA/CAB) — a material encountered less often, more commonly in older solutions. It is more susceptible to chemical damage, has limited chlorine tolerance, but can be less costly to produce and is biodegradable.
Membrane layers
Polyamide layer — the outer layer in direct contact with water, responsible for rejecting a large amount of contaminants.
Support layer — usually made of polysulfone, it reinforces the membrane structure and helps it operate under high pressure.
Protective layer — present in selected models and protects the more delicate layers against mechanical damage and contamination.
Which brand of osmotic membrane should you choose?
Among recognizable manufacturers of osmotic membranes are brands valued for quality, durability, and good filtration effectiveness.
Filmtec (Dow Chemical) — high-quality membranes valued for durability and resistance to contaminants.
Vontron — a popular choice due to its favorable price-to-quality ratio.
AC-OM and Aquafilter — brands known for reliable solutions in various applications.
Pentair — a manufacturer associated with innovation and advanced membrane technology.
FAQ – frequently asked questions
How often should an osmotic membrane be replaced?
It is recommended to replace the osmotic membrane every 3–4 years, although the actual frequency depends on feed water quality and the intensity of system use.
What does an osmotic membrane remove?
An osmotic membrane helps remove bacteria, viruses, heavy metals, chlorine, and many organic and inorganic compounds. Thanks to its highly precise structure, filtration takes place at the molecular level.
Does an osmosis filter remove limescale?
Yes. Reverse osmosis effectively removes calcium and magnesium ions from water, which significantly reduces the risk of limescale formation in appliances and installations using purified water.
Which osmosis membrane is suitable for home use?
For smaller households, 50 GPD or 75 GPD membranes are the most common choice. In larger homes, 100 GPD or 150 GPD models work better, especially when water demand is higher.
How do you match a membrane to water demand?
The best approach is to determine how much purified water you need per day. On this basis, the membrane capacity is selected: from household models to 400 GPD, 600 GPD, or 2400 GPD solutions for commercial and industrial applications.
Which restrictor should you choose for a 75 GPD, 100 GPD, and 50 GPD membrane?
For a 75 GPD membrane, a 350 or 420 restrictor is usually used; for 100 GPD, a 420 or 550 restrictor; and for 50 GPD, a 350 restrictor. The choice depends on whether lower water loss or a faster filtration rate is the priority.
Does a higher GPD number mean a better membrane?
Not always. Higher capacity means greater purified water production per day, but the best membrane is one that is properly matched to the system, water quality, and the user’s actual demand.
Where are osmotic membranes used outside the home?
Osmotic membranes are used, among other places, in the pharmaceutical industry, car washes, hospitals, laboratories, and in small and large industrial plants.
What materials are osmotic membranes made from?
The most commonly used material is TFC polyamide, a thin-film composite with high filtration efficiency. Less commonly, cellulose acetate CA/CAB membranes are found, mainly in older solutions.
