Setting the industry standard for the highest salt rejection rates

Ultrapure water is essential in several industrial applications. CPA RO membranes are regarded as the industry standard for all critical high purity applications – from pharmaceutical to power industry.

CPA lines of spiral-wound RO membranes are available in a variety of sizes and deliver unmatched performance with the highest salt rejection rates for brackish water applications. High throughput, efficiency and cost-effectiveness make CPA membranes the best high-rejection brackish water RO membranes in the industry.

Because of its exceptionally high salt rejection, CPA membranes are used in power generation, pharmaceutical, electronics and semiconductor industry.

CPA2 is the second generation CPA high rejection brackish water RO membrane introduced in the early 1990’s. This membrane with 365 square feet of membrane area and 99.7% rejection remains popular today as a robust work-horse product for Hydranautics.

CPA2 is popularly used in the treatment of brackish waters to produce low TDS permeate.

CPA2 membrane is available in diameters of 4.0 and 8.0 inches.

Product NameSizeDownload
CPA2-4040 4″ diameter & 40″ length
CPA2 8″ diameter & 40″ length

CPA3 is the third generation CPA high rejection brackish water RO membrane introduced in the late 1990’s. This membrane at 99.7% rejection is an upgrade to the CPA2 with 10% more membrane area (400 square feet). This resulted in reduced capital costs by requiring fewer pressure vessels and less floor space.

CPA3 membranes also have a thicker (31 mil) feed spacer that exhibits higher tolerance to feed water suspended solids.

CPA3 membrane is available in diameters of 8.0 inches.

Product NameSizeDownload
CPA3 8″ diameter & 40″ length

CPA5-LD is the fourth generation CPA high rejection brackish water RO membrane. This 400 sq. ft. membrane with 99.7% rejection was an upgrade to the CPA3 membrane as it is designed with Low Differential Pressure LDTM. It offers the improved rejection of all ions including silica and nitrates.

CPA5-LD membranes use a patented 34 mil thickness feed spacer that increases effectiveness of membrane cleaning.

As a result, the CPA5-LD membrane does not need to be cleaned frequently – thus reducing treatment cost – while offering extreme durability and consistent performance.

CPA5-MAX membranes have 440 square feet of membrane area and are well suited for polishing RO and low fouling applications. This increased membrane area can reduce capital costs by requiring fewer pressure vessels and less floor space.

CPA5-LD membrane is available in diameters of 4.0 and 8.0 inches and the CPA5-MAX membrane is available in 8.0 inch diameter.

Product NameSizeDownload
CPA5-LD-4040 4″ diameter & 40″ length
CPA5-LD 8″ diameter & 40″ length
CPA5 MAX 8″ diameter & 40″ length

CPA6-LD is the fifth generation CPA brackish water RO membrane and has the best rejection of all of its predecessors at 99.8%. This 400 sq. ft. membrane operates at a higher feed pressure than CPA5-LD but it has the highest rejection in the CPA family.

CPA6-LD membranes are designed with Low Differential Pressure LDTM Technology designed to minimize colloidal fouling. They have 37.0 m2 (400 ft2) membrane area. Using CPA6-LD results in cost saving while still getting a high rejection from membranes.

CPA6-MAX has the same high rejection membrane of CPA6-LD, but features a 10% increase in membrane area at 440 sq.ft. CPA6 MAX is a preferred choice for feed waters of low turbidity and silt density index such as brackish well waters.

CPA6-LD and CPA6-MAX membranes are available in diameters of 8.0 inches only.

Product NameSizeDownload
CPA6-LD 8″ diameter & 40″ length
CPA6-MAX 8″ diameter & 40″ length

Product NameSizeDownload

CPA-4040E 4″ diameter & 40″ length