Hydranautics CPA5-LD-4040 Reverse Osmosis Membrane
- 4”x40” Hi Rejection Brackish Water Membrane.
- 2100 gpd / 99.7% / 225 PSI.
- Offers a combination of high rejection and reliability.
- Suitable for high salinity brackish water.
- FREE Delivery (regional areas excluded)*
Hydranautics CPA5-LD-4040, 4 inch x 40 inch Brackish Water RO Membrane
Hydranautics CPA5-LD-4040 brackish water membrane delivers high permeate flows and salt rejection at high salinity inlet water (up to 8000 ppm NaCl Salinity).
CPA5-LD is the fourth generation CPA high rejection brackish water RO membrane. It is designed with Low Differential Pressure LD. 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..
Manufactured by Hydranautics , Nitto Group.
Specified Performance*:
Permeate Flow: 2,100 gpd (7.95 m3 /d).
Salt Rejection: 99.7% (99.5% minimum).
Membrane Area: 80 ft².
Diameter/Length: 4 inch / 40 inch.
Feed Spacer Thickness: 34 mil.
Configuration: Low Fouling Spiral Wound
Membrane Polymer: Composite Polyamide.
Test conditions: 1500 ppm NaCl solution 225 psi (1.55 MPa) Applied Pressure, 25 °C (77 °F), pH 6.5-7, recovery rate 15%.
*The Specified Performance is based on data taken after approximately 30 minutes of operation. Actual testing of elements may be done at conditions which vary from these exact values; in which case, the performance is normalized back to these standard conditions. Permeate flow for individual elements may vary +25 / -15 percent from the value specified.
Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).
Product Use and Restrictions
Maximum Applied Pressure: 600 psig (4.14 MPa)
Maximum Chlorine Concentration: < 0.1 ppm
Maximum Operating Temperature: 113 °F (45 °C)
pH Range, Continuous (Cleaning): 2-11 (1-13)
Maximum Feedwater Turbidity: 1.0 NTU
Maximum Feedwater SDI (15 mins): 5.0
Maximum Feed Flow: 16 gpm (3.6 m3 /h)
Maximum Pressure Drop for Each Element: 15 psi (0.10 MPa)
Commercial Application:
- Drinking water.
- Softened water for homes, hotels, commercial laundries and car wash.
- Spot free rinse for window cleaning and solar panel cleaning
- Pure water for pharmaceuticals, laboratories, Hemodialysis and electronics
- Sterilisers and autoclaves.
- Chemical industry.
- Aquarium water treatment.
- Boiler and cooling towers make-up water.
- Pure water, boiler water replenishment, foodstuff processing, and pharmaceutical production.
Compatible with reverse osmosis membrane types:*
Filmtec BW30-4040 / Lanxess B085 FR 4040 / GE Desal AG4040 / Hydranautics CPA2-4040 / Toray TM710 / CSM RE4040-BE.
*Check the data sheet for each membrane.
* We offer FREE Shipping within Australia, however we might charge you in case of remote areas.
If you are in a remote area, please contact us before buying this item, info@waterfilter.net.au.
Cant be send to a postal address (big item).
Download:
Technical Data Sheet
Vidoe
-
Estimated Delivery:Jul 23 - Jul 27
-
Next Day Dispatch

Hydranautics CPA5-LD-4040 Reverse Osmosis Membrane
- 4”x40” Hi Rejection Brackish Water Membrane.
- 2100 gpd / 99.7% / 225 PSI.
- Offers a combination of high rejection and reliability.
- Suitable for high salinity brackish water.
- FREE Delivery (regional areas excluded)*
Hydranautics CPA5-LD-4040, 4 inch x 40 inch Brackish Water RO Membrane
Hydranautics CPA5-LD-4040 brackish water membrane delivers high permeate flows and salt rejection at high salinity inlet water (up to 8000 ppm NaCl Salinity).
CPA5-LD is the fourth generation CPA high rejection brackish water RO membrane. It is designed with Low Differential Pressure LD. 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..
Manufactured by Hydranautics , Nitto Group.
Specified Performance*:
Permeate Flow: 2,100 gpd (7.95 m3 /d).
Salt Rejection: 99.7% (99.5% minimum).
Membrane Area: 80 ft².
Diameter/Length: 4 inch / 40 inch.
Feed Spacer Thickness: 34 mil.
Configuration: Low Fouling Spiral Wound
Membrane Polymer: Composite Polyamide.
Test conditions: 1500 ppm NaCl solution 225 psi (1.55 MPa) Applied Pressure, 25 °C (77 °F), pH 6.5-7, recovery rate 15%.
*The Specified Performance is based on data taken after approximately 30 minutes of operation. Actual testing of elements may be done at conditions which vary from these exact values; in which case, the performance is normalized back to these standard conditions. Permeate flow for individual elements may vary +25 / -15 percent from the value specified.
Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).
Product Use and Restrictions
Maximum Applied Pressure: 600 psig (4.14 MPa)
Maximum Chlorine Concentration: < 0.1 ppm
Maximum Operating Temperature: 113 °F (45 °C)
pH Range, Continuous (Cleaning): 2-11 (1-13)
Maximum Feedwater Turbidity: 1.0 NTU
Maximum Feedwater SDI (15 mins): 5.0
Maximum Feed Flow: 16 gpm (3.6 m3 /h)
Maximum Pressure Drop for Each Element: 15 psi (0.10 MPa)
Commercial Application:
- Drinking water.
- Softened water for homes, hotels, commercial laundries and car wash.
- Spot free rinse for window cleaning and solar panel cleaning
- Pure water for pharmaceuticals, laboratories, Hemodialysis and electronics
- Sterilisers and autoclaves.
- Chemical industry.
- Aquarium water treatment.
- Boiler and cooling towers make-up water.
- Pure water, boiler water replenishment, foodstuff processing, and pharmaceutical production.
Compatible with reverse osmosis membrane types:*
Filmtec BW30-4040 / Lanxess B085 FR 4040 / GE Desal AG4040 / Hydranautics CPA2-4040 / Toray TM710 / CSM RE4040-BE.
*Check the data sheet for each membrane.
* We offer FREE Shipping within Australia, however we might charge you in case of remote areas.
If you are in a remote area, please contact us before buying this item, info@waterfilter.net.au.
Cant be send to a postal address (big item).
Download:
Technical Data Sheet
Vidoe
Discover more in our FAQ
What types of industrial water treatment products do you offer?
We offer a comprehensive range of industrial water treatment solutions, including:
Filtration Systems – Effectively removes sediment, chlorine, and other impurities to enhance water purity and system longevity.
Reverse Osmosis Membranes – High-performance purification technology that eliminates dissolved solids, contaminants, and impurities for ultra-pure water.
Membrane Housings – Durable, high-pressure enclosures engineered to protect and optimize the performance of RO membranes.
Filter Cartridges – Precision-engineered sediment, carbon, and specialty filters designed to target specific contaminants for enhanced water treatment efficiency.
Chemical Dosing Systems – Precise chemical treatment for water.
Media FRP Pressure Vessels – High-pressure tanks for filtration media.
Ion Exchange Resins – Softening and demineralization solutions.
Water Instruments – pH meters, conductivity meters, and TDS testers.
Rotameter Flow Meters – Accurate flow measurement devices.
Watermaker Parts – Spare parts for marine and industrial watermakers.
Water Quality Test Kits – Portable and lab testing solutions.
How do I know which product is right for my application?
Choosing the right product depends on:
Water quality parameters (TDS, pH, hardness, contaminants)
Flow rate and pressure requirements
Industry-specific needs (food processing, pharmaceuticals, HVAC, etc.)
If you’re unsure, our technical support team can help you select the best solution.
Do you offer bulk pricing for large industrial orders?
Yes! We provide bulk discounts and custom pricing for high-volume orders. Contact us for a personalized quote.
How long does shipping take?
Shipping times depend on location and stock availability. Standard delivery is 3–7 business days for most regions. Expedited shipping options are available upon request.
What is your return policy?
We offer a 14-day return policy from the date of delivery. If you are not completely satisfied with your purchase, you can return the item for a refund or exchange, provided it meets our return conditions.
What happens if I receive a damaged or incorrect item?
If your item arrives damaged or you receive the wrong product, please contact us immediately at support@waterfilter.net.au with photos and your order number. We will send a replacement or issue a refund as per our return policy..
How long does shipping take?
Shipping times depend on location and stock availability. Standard delivery is 3–7 business days for most regions.
Expedited shipping options are available upon request.
Do you ship internationally?
Yes, we offer international shipping for most of our industrial water treatment products. Contact us for custom shipping quotes and lead times.