CPA5 MAX Reverse Osmosis Membrane – High-Performance Brackish Water Filter

Elevate your water purification system with the Hydranautics CPA5 MAX, a premium 8" x 40" composite polyamide RO membrane engineered for maximum salt rejection and exceptional throughput in demanding applications. Whether you're desalting well water for municipal drinking supplies, producing high-purity boiler makeup water, polishing ultrapure water for industrial processes, or reducing TDS before ion exchange, the CPA5 MAX delivers industry-leading performance you can trust.

Key Specifications & Performance

• Permeate Flow: 12,000 gallons per day (45.4 m³/day)
• Salt Rejection: 99.7% (99.6% minimum) — among the highest in its class
• Active Membrane Area: 440 ft² (40.9 m²) — increased surface area for higher productivity
• Test Conditions: 1,500 ppm NaCl, 225 psig (15.5 bar) applied pressure, 77°F (25°C), 15% recovery, pH 6.5–7.0

Configuration: Spiral wound Membrane Polymer: Advanced composite polyamide Dimensions: 8" diameter x 40" length (with brine seal, interconnector, and O-rings included)

Why Choose the CPA5 MAX?

• Superior Fouling Resistance: Optimized design minimizes biofouling and colloidal fouling, extending membrane life and reducing cleaning frequency.
• Enhanced Cleanability: Stays cleaner longer and responds better to maintenance — keeping your system running efficiently with lower operating costs.
• High Rejection Across Variable Waters: Excels with brackish, low-salinity feeds (typically 2,000–8,000 ppm TDS range) while maintaining consistent high performance.
• Robust Operating Limits:
  • Max pressure: 600 psig (41.4 bar)
  • Max temperature: 113°F (45°C)
  • pH range (continuous): 2–11 (cleaning: 1–13)
  • Max feed flow: 75 gpm
  • Low chlorine tolerance (<0.1 ppm) — standard for thin-film composite membranes

This membrane is ideal for commercial, industrial, and municipal RO systems where reliability, high output, and ultra-low permeate TDS are non-negotiable.

Built for Real-World Reliability

Packaged with a protective sodium meta-bisulfite solution and ready for immediate installation, every CPA5 MAX element from KnappRO undergoes strict quality assurance. Trusted by water treatment professionals worldwide, Hydranautics CPA series membranes set the benchmark for consistent, high-rejection performance.

Price: $590.00 USD (competitive pricing with fast shipping options available)

Upgrade your RO system today with the CPA5 MAX — powerful rejection, maximum productivity, and the durability your operation demands. Perfect for standalone use or as part of multi-stage arrays.

Questions about compatibility with your existing pressure vessels, feedwater chemistry, or system design? Reach out — we're here to help optimize your setup for peak performance.

Shop confidently at KnappRO Chicago — Quality membranes, affordable prices, and expert support for your water treatment needs.