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?

1. Ultra-high salt rejection (99.7%) — excellent for high-purity water.

2. Stable permeate output of 11,000 gpd for industrial throughput.

3. Low-fouling design with 34-mil feed spacer improves durability and cleaning efficiency.

4. Global industry acceptance for brackish water desalination and RO polishing.

5. 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