The ERI PX-400 (also written PX400) is a 400 GPM (91 m³/h) isobaric pressure exchanger designed for seawater reverse osmosis systems in the 50,000–100,000 GPD range. Standard PX series delivers 97%+ pressure transfer efficiency, cutting SWRO energy by 55-60%. The PX-400 contains a single ceramic rotor that spins hydraulically (no motor) at 1,200-1,800 RPM. As the rotor spins, axial channels alternately fill with low-pressure feed water and high-pressure brine. The pressure transfers directly fluid-to-fluid, recovering the high-pressure brine energy and pressurizing incoming feed at 97% efficiency. This eliminates the need for the high-pressure pump to handle the full feed flow — only the permeate fraction (~40%). Customers searching for this device commonly use these keywords: PX-400, PX400, ERI PX-400, ERI PX400, px-400 pressure exchanger, px400 energy recovery device, px-400 SWRO. ForeverPure stocks the PX-400 and standard PX series for same-week dispatch. Send us your SWRO system specs (target permeate flow, feed water TDS, operating hours) and we'll confirm PX-400 fit and provide a formal quote within one business day. Request PX-400 Quote → · All ERI PX Models · SWRO Buyer's GuideERI PX-400 (PX400) Pressure Exchanger: 400 GPM Isobaric Energy Recovery for SWRO
PX-400 Quick Specifications
Manufacturer Energy Recovery Inc (ERI) Model PX-400 (also written PX400) Flow Rate 91 m³/h (400 GPM) Max Pressure 83 bar (1,200 psi) Efficiency 97%+ SWRO System Range 50,000–100,000 GPD product water Materials 2507 super-duplex stainless steel housing, alumina ceramic rotor Acoustic ~78 dB(A) Stock 2-3 weeks lead How the PX-400 (PX400) Works
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