CPA7 MAX Reverse Osmosis Membrane – Ultra-High Rejection Brackish Water Element

Take your water treatment system to the next level with the Hydranautics CPA7 MAX, the latest in the acclaimed CPA series of brackish water RO membranes. Offering the highest salt rejection available in the industry combined with high productivity, this 8" x 40" composite polyamide membrane is engineered for applications demanding the purest water quality — even under challenging feedwater conditions.

Key Specifications & Performance

• Permeate Flow: 12,600 gallons per day (47.7 m³/day)
• Salt Rejection: 99.8% (99.7% minimum) — setting a new standard for ultra-high purity
• Active Membrane Area: 440 ft² (40.9 m²) — maximized surface area for greater output and fewer vessels required
• 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 (includes brine seal, interconnector, and O-rings)

Standout Features

• Industry-Leading Rejection: Delivers unmatched purity for critical applications where even trace dissolved solids are unacceptable.
• High Flow + Efficiency: The MAX design packs more active area into the standard element size, reducing capital costs by requiring fewer pressure vessels and less floor space while maintaining excellent productivity.
• Fouling Resistance & Durability: Built on Hydranautics’ proven technology for minimized biofouling and colloidal fouling, with strong cleanability for longer service life and lower maintenance.
• Robust Operating Limits:
  • Max Applied Pressure: 600 psig (4.14 MPa)
  • Max Operating Temperature: 113°F (45°C)
  • pH Range (Continuous / Cleaning): 2–11 (1–13)
  • Max Feedwater Turbidity: 1.0 NTU
  • Max Feedwater SDI (15 min): 5.0
  • Max Feed Flow: 75 gpm (17.0 m³/h)
  • Max Pressure Drop per Element: 15 psi
  • Chlorine Tolerance: < 0.1 ppm

Ideal Applications

• Municipal drinking water production from brackish wells
• Boiler makeup and ultrapure water systems
• Semiconductor and electronics manufacturing
• TDS reduction prior to ion exchange or polishing
• Industrial process water where ultra-high purity is essential
• Any system needing the best combination of high rejection and high flow in brackish conditions

Premium Quality You Can Rely On

Each CPA7 MAX element is supplied in a sealed polyethylene bag with sodium meta-bisulfite preservative, ready for reliable long-term performance in continuous-duty commercial, industrial, and municipal RO systems.

Price: Competitive pricing through KnappRO Chicago (contact for current quote or volume discounts)

Why KnappRO? Quality Hydranautics membranes at accessible prices, with fast shipping and expert support tailored to your system needs.

Ready to upgrade to the highest rejection membrane available? Add the CPA7 MAX to your cart today or reach out for system compatibility advice, array design recommendations, or bulk ordering.

KnappRO Chicago — Quality membranes, affordable prices, exceptional water treatment results.