Hydranautics CPA3 is a high-rejection brackish water RO membrane with 11,000 GPD permeate flow, 99.7% salt rejection, and a 400 ft² composite polyamide spiral-wound design. Built for reliable performance in industrial and municipal applications.
The Hydranautics CPA3 is a premium brackish-water reverse osmosis (RO) membrane engineered for applications requiring extremely high purity and consistent, long-term performance. Part of Hydranautics’ proven CPA (Composite Polyamide) series, the CPA3 combines high salt rejection, robust permeate flow, and enhanced fouling resistance, making it a top choice for industries with demanding water quality standards.
📌 Key Performance Specifications
(From the official Hydranautics CPA3 datasheet)
Permeate Flow: 11,000 gpd (41.6 m³/day)
Salt Rejection: 99.7% (99.6% minimum)
Membrane Type: Composite Polyamide, Spiral-Wound
Active Membrane Area: 400 ft² (37.2 m²)
Feed Spacer Thickness: 34 mil (0.86 mm) — helps reduce fouling & improves cleaning efficiency
Standard Test Conditions
Feedwater: 1500 ppm NaCl solution
Pressure: 225 psig (1.55 MPa)
Temperature: 25°C (77°F)
Recovery: 15%
pH: 6.5–7.0
📌 Operating & Design Limits
(All taken directly from the datasheet)
Max Pressure: 600 psig (4.14 MPa)
Max Feed Flow: 85 gpm (19.3 m³/h)
Minimum Brine Flow: 12 gpm (2.7 m³/h)
Max Pressure Drop per Element: 15 psi (0.10 MPa)
Max Operating Temp: 113°F (45°C)
pH Range (Continuous): 2–10.8
pH Range (Cleaning): 1–12.5
Max Chlorine Tolerance: <0.1 ppm
Max Feedwater Turbidity: 1.0 NTU
Max SDI: 5.0
📌 Physical Dimensions
Length (A): 40.0 in (1016 mm)
Diameter (B): 7.89 in (200 mm)
Permeate Tube (C): 1.125 in (28.6 mm)
⭐ Why Choose Hydranautics CPA3?
Ultra-high salt rejection (99.7%) — excellent for high-purity water.
Stable permeate output of 11,000 gpd for industrial throughput.
Low-fouling design with 34-mil feed spacer improves durability and cleaning efficiency.
Global industry acceptance for brackish water desalination and RO polishing.
Reliable 400 ft² active area ensures sustained performance with reduced maintenance.
📌 Typical Applications
Brackish water desalination
Power plant & boiler feedwater
High-purity industrial process water
Municipal drinking water production
Pharmaceutical & food industry water treatment
RO-polishing for ultrapure water systems