ESPA4-LD HP Hydranautics Nitto 100 PSI at 11,000 GPD 8 x 40 inch Membranes

Hydranautics ESPA4-LD HP Reverse Osmosis Membrane

The Hydranautics (Nitto) ESPA4-LD HP is a high-performance, Energy Saving Polyamide (ESPA) membrane designed for applications requiring a unique balance of ultra-low operating pressure and high-pressure durability. This model is a specialized high-flux variant of the ESPA4 series, featuring a robust high-pressure construction that allows it to operate up to 1200 PSI. This capability makes it exceptionally effective for concentrating feed solutions, such as in maple sap concentration, where it balances high sucrose rejection with superior permeate flow.

Equipped with Low Differential (LD) Technology®, this membrane is engineered to minimize colloidal fouling, significantly extending the intervals between chemical cleanings. Its 34 mil feed spacer enhances turbulence and flow distribution, further reducing the risk of element plugging. Whether used as a second-pass polisher in seawater desalination or for industrial wastewater recovery, the ESPA4-LD HP provides industry-leading energy efficiency without compromising the high salt rejection standards required for pure water production.