Diaphragm Metering Pump/Dosing Pump
Reverse Osmosis Membranes
RO membrane,as semi-permeable membrane used in water treatment to achieve efficient purification of water by blocking dissolved substances and impurities.
●  Types of RO Membranes
●  Handling Capacity of RO Membranes
●  The Material of RO Membranes
RO system membrane is a core element in the ro system
and raw water is applied to the membrane through a high-pressure pump, creating a high pressure water flow that forces the water molecules through the RO membrane.
SD reverse osmosis membrane can trap substances greater than 0.0001 micron, which can effectively trap all dissolved salts and organic matter and microorganisms with molecular weight greater than 100, and separate pure water.


8040 membrane

Effective Membrane Area(㎡): 365(33.9)-400(37.0)
Average Permeated Flow GPD (m³/d) :
11000(41.6) -13200(49.9)
Stable Rejection Rate (%): 98-99.5
Minimum Rejection Rate (%): 97.5-99
Application: Large-scale environmental engineering, Municipal water supply.

Size: 8*40 inch RO membrane

4040 membrane

Size: 4*40 inch RO membrane
Effective Membrane Area(㎡): 90(8.4)
Average Permeated Flow GPD (m³/d) : 1900(7.2)-2700(10.2)
Stable Rejection Rate (%) : 98-99.4
Minimum Rejection Rate (%): 97.5-99
Application: Large pharmaceutical and manufacturing industries, Electronic manufacturing.

4021 membrane

Average Permeated Flow GPD (m³/d): 850(3.2)
Stable Rejection Rate (%): 98-99.4
Minimum Rejection Rate (%): 97.5-99
Application: Restaurants and Food Services, Beverage production, Pharmaceutical and medical facilities, Water treatment plant.

Size: 4*20 inch RO membrane
Effective Membrane Area(㎡): 36(3.3)

2540 membrane

Application: Restaurants and Food Services, 
Beverage production, Pharmaceutical
and medical facilities.
Size :2*40 inch RO membrane
Effective Membrane Area(㎡): 30(2.8)
Average Permeated Flow GPD (m³/d) : 750(2.84)
Stable Rejection Rate (%): 99
Minimum Rejection Rate (%): 98.5


Reverse Osmosis (RO) membranes are typically made from synthetic materials that are carefully engineered to have specific characteristics suitable for water purification and desalination processes.

Polyamide (PA)

Polyamide is the most common material for thin-film composite (TFC) RO membranes. It forms the active layer of the membrane and is responsible for the separation of water molecules from dissolved solids and contaminants. Polyamide membranes are known for their high desalination efficiency.

Polysulfone (PS)

Polysulfone membranes are often used in ultrafiltration (UF) and microfiltration (MF) applications, but they can also be used in some RO applications, particularly when dealing with certain industrial wastewater streams.

Cellulose Acetate (CA)

Cellulose acetate membranes were used in earlier generations of RO membranes but are less common today. They are more chlorine-tolerant compared to some other materials.

Polyethersulfone (PES)

Polyethersulfone membranes are known for their resistance to heat and chemical degradation. They are used in various membrane processes, including RO.


Drinking water purification

Reverse osmosis membranes are commonly used in residential and commercial water filtration systems to remove impurities, including salts, minerals, heavy metals, and microorganisms, providing safe and clean drinking water.

Wastewater treatment

Reverse osmosis membranes are used in wastewater treatment plants to purify and recover treated wastewater for reuse in industrial processes or as a water source for irrigation.


Reverse osmosis is a key technology for desalting seawater and brackish water, making it suitable for drinking water, agriculture, and industrial use in water-scarce areas.

Food and beverage industry

Reverse osmosis membranes are used for water purification in food and beverage production, ensuring that the water used in the production process is of high quality and free of contaminants.

Pharmaceutical industry

Reverse osmosis is used in the pharmaceutical industry to produce highly pure water, which is a key component of pharmaceutical manufacturing, as well as to remove impurities from various solutions and suspensions.

Power generation

In power plants, reverse osmosis membranes are used to treat the feedwater produced by steam, preventing boiler scaling and corrosion by removing impurities.


  • Q What the types of RO water membrane cleaning?

    A 1.Backwashing: This involves reversing the flow of water through the membrane to dislodge loose particles and flush them out.
    2.Chemical cleaning: Specific cleaning chemicals, such as citric acid, sodium hydroxide, or specialized RO membrane cleaners, can be used to remove scale, foulants, and organic matter.  The choice of chemical will depend on the type of fouling or scaling.
    3.Mechanical cleaning: In some cases, physical scrubbing or brushing of the membrane surface may be necessary to remove stubborn deposits.
    4.Pre-treatment: Effective pre-treatment processes like sediment filtration, activated carbon filtration, and water softening can help reduce fouling and scaling before the water reaches the RO membrane.

  • Q What do we pay attention on RO membrane replacement?

    A 1.Before starting the replacement process, shut off the water supply to the RO system to prevent water from flowing into the system during the replacement.

    2.Open the RO faucet to release any pressure in the system and to drain the remaining water.

    3.According to the markings on the membrane indicating the flow direction, make sure it is correctly oriented when installing the new membrane cartridge.

    4.After installing the new membrane, flush the system for a few minutes to remove any residual air or contaminants.

    5.When reattaching the filter housing, make sure it is tightened securely but not overtightened.  Over-tightening can damage the housing or its threads.

    6.After repressurizing the system, check for any leaks around the filter housing, connections, and fittings.

    7.Test the water quality using TDS (Total Dissolved Solids) after the replacement to ensure that the new membrane is functioning correctly. 

  • Q What the different reverse osmosis elements?

    A 1. Thin-Film Composite (TFC) Membranes: TFC membranes are the most common type of RO membranes used in residential and commercial RO systems.  They consist of a thin-film polyamide layer on top of a porous support membrane.
    2.Cellulose Triacetate (CTA) Membranes: CTA membranes are primarily used for low-salinity water sources and are less susceptible to chlorine damage compared to TFC membranes.  They are commonly employed in some point-of-use and point-of-entry residential RO systems.
    3. Brackish Water RO Membranes: These RO membranes are designed for treating brackish water sources, which contain higher levels of dissolved solids than typical drinking water but lower salinity than seawater.
    4.Seawater RO Membranes: Seawater RO membranes are specifically engineered for desalination applications.  They are highly efficient in removing salt and other impurities from seawater.  These membranes are used in desalination plants to produce fresh water from seawater.
    5. Ultra-Low-Pressure (ULP) RO Membranes: ULP membranes are designed to operate at significantly lower pressures than traditional RO membranes.
    6. High-Rejection RO Membranes: These membranes are designed to provide exceptional contaminant removal capabilities, especially for specific contaminants such as nitrates, arsenic, or other targeted impurities.  
    7.Residential RO Membranes: These are typically TFC membranes designed for use in home-based under-sink or countertop RO systems.  They are optimized for producing safe and clean drinking water.
    8.Commercial and Industrial RO Membranes: RO membranes for commercial and industrial applications come in various sizes and configurations to handle higher water volumes and diverse water sources.  
    9.Nanofiltration (NF) Membranes: While not technically RO membranes, NF membranes are a related technology that operates at a slightly lower level of rejection than RO membranes.  They are used for removing larger ions and molecules while allowing some smaller ions to pass through. 

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