SWC5-LD-4040 Hydranautics Nitto 1,750 GPD at 800 PSI 4 x 40 inch Membranes

Hydranautics SWC5-LD-4040 Seawater RO Membrane

The Hydranautics SWC5-LD-4040 (manufactured by a Nitto Group Company) is a high-performance, 4-inch by 40-inch seawater composite (SWC) reverse osmosis membrane engineered for industrial and commercial desalination. This low-fouling, spiral-wound element is constructed using advanced composite polyamide polymer technology. It integrates Hydranautics' proprietary Low Differential (LD) Technology, utilizing a 34-mil feed spacer that minimizes colloidal fouling when paired with conventional pre-treatment equipment. This specialized spacer design ensures consistently low feed pressures, optimizes flow dynamics, and significantly extends the duration between required cleanings for continuous-duty systems.

Designed for demanding seawater and high-salinity applications, the SWC5-LD-4040 delivers a highly efficient permeate flow rate of 1,750 GPD (6.62 m³/d) combined with an exceptional nominal salt rejection of 99.7%. The element features 80 square feet of active membrane area and operates efficiently at a standard test pressure of 800 PSI. Built to withstand rigorous operational environments, this robust membrane safely accommodates a maximum applied pressure of 1200 PSI, a maximum feed flow of 16 GPM, and liquid temperatures up to 113°F (45°C). By combining high energy efficiency with optimized permeate output, it is the premier choice for mega desalination plants and high-demand commercial watermakers.