Hydranautics BW CPA2 4040 Membrane

Hydranautics BW CPA2 is the second generation CPA high rejection brackish water RO membrane introduced in the early 1990’s. CPA2 membrane is available in diameters of 4” x 4 inches length and 99.7% rejection remains popular today as a robust work-horse product for Hydranautics. CPA2 4040 element is popularly used in the treatment of brackish waters to produce low TDS permeate.

  • 99.7% nominal rejection
  • High TOC, silica and hardness rejection
  • Permeate Flow: 2,250 gpd (8.5 m3/d)


Hydranautics membranes are used to treat a wide range of highly variable waters as either primary treatment or as pre-treatment to reverse osmosis (RO) and nanofiltration (NF).
CPA (Composite Polyamide) elements set the standard for RO membrane elements – over 600 million gallons per day of pure water are produced by CPA elements for global municipalities and industries.

Application Data

  • Configuration: Spiral Wound
  • Membrane Polymer: Composite Polyamide
  • Membrane Active Area: 85 ft2 (7.9 m2)
  • Application Data*
  • Maximum Applied Pressure: 600 psig (4.14 MPa)
  • Maximum Chlorine Concentration: < 0.1 PPM
  • Maximum Operating Temperature: 113 oF (45 oC)
  • pH Range, Continuous (Cleaning): 2-10 (1-12)*
  • Maximum Feedwater Turbidity: 1.0 NTU
  • Maximum Feedwater SDI (15 mins): 5.0
  • Maximum Feed Flow: 16 GPM (3.6 m3/h)
  • Minimum Ratio of Concentrate to Permeate Flow for any Element: 5:1
  • Maximum Pressure Drop for Each Element: 15 psi

* The limitations shown here are for general use. For specific projects, operating at more conservative values may ensure the best performance and longest life of the membrane. See Hydranautics Technical Bulletins for more detail on operation limits, cleaning pH, and cleaning temperatures.

Test Conditions

The stated performance is initial (data taken after 30 minutes of operation), based on the following conditions:

  • 1500 PPM NaCl solution
  • 225 psi (1.55 MPa) Applied Pressure
  • 77 oF (25 oC) Operating Temperature
  • 15% Permeate Recovery
  • 6.5 – 7.0 pH Range


The Reverse Osmosis water filtration technology Membrane by Hydranautics (Nitto) is designed for Brackish Water applications that require a psi of 225. This Membrane uses Reverse Osmosis water filtration technology to take out 99.50% of contaminants found in the feedwater, which makes it best suited for power generation, pharmaceutical, electronics, and semiconductor industry.

Hydranautics BW CPA2 4040 Membrane Dubai

Water is essential for the existence of humankind. It is largely available on the earth, yet safe and potable water is scarce in many areas. Water does not provide any calories, but it’s still crucial for each living being, be it human, animal, or even plants. In places that lack the source of potable water, seawater and brackish water go through desalination and filtration to provide drinking water. And that’s when the Hydranautics membrane comes into the picture.

Basics of desalination and reverse osmosis

Desalination refers to a process of removing excess salts from brackish water and makes it safe and potable for domestic purposes. Reverse osmosis is the most prevalent method of desalination of brackish and seawater. The pure water obtained after the desalination can get used for human consumption, commercial and industrial applications, etc.

In recent years, there has been rapid growth in the number of desalination plants worldwide. Two primary motivators are causing the growth in desalination plants. They are:-  (a) Increased demand for potable water due to the unavailability of reliable water sources. (b) Cost-efficiency of RO membrane desalination.

Reverse osmosis or RO is a treatment technology that applies pressure to pass source water through the membrane and thus, separating contaminants from the water. RO works by reversing the natural osmosis process. Water has a natural tendency to pass through the membrane from low to high salt density.

RO system uses a pump to generate pressure; then, it forces the water with all its contaminants to pass through a highly sophisticated semi-permeable membrane designed by Hydranautics. It removes a significant amount of impurities from the water, and you get purified water as a result.

Why is Hydranautics BW CPA2 4040 membrane right for you?

Nitto Hydranautics is one of the leading companies in the field of manufacturing water filtration systems like membranes. They manufacture products by adhering to strict quality standards, and the results you get are amazing. CPA2 is the second generation CPA high rejection brackish water RO membrane introduced by Hydranautics. The membrane Hydranautics BW CPA2 4040 can remove 99.50% of the impurities found in the feed water. Now days many industries like pharmaceuticals, electronics, power generation plants, and semi-conductor industries are preferred Hydranautics BW CPA2 4040 elements.

Hydranautics CPA2 4040 membranes are used one of the most advanced and efficient membrane materials. It provides rejection of contaminants up to 99.7% and its membrane area comprises of 365 square feet. CPA2 4040 offers you the best salt rejection rate for brackish and seawater.

Hydranautics CPA2-4040 membranes set the standard for RO membrane elements. The Hydranautics BW CPA2 4040 membranes are one of the best available elements in the UAE market. If you looking to have a free-flowing source of potable water for residential or industrial purposes, then you should get in touch with a reputable Hydranautics RO water element supplier in Dubai.

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