Replaces ESPA-4021 Hydranautics Nitto 1000 GPD at 100 PSI 4 x 21 inch 99% Rejection Energy Saving Membranes

4" x 21" Extra Low Pressure RO Membrane (ESPA-4021 Compatible, 1,000 GPD)

Engineered as a premium, direct-fit replacement for the ESPA-4021, this industrial-grade, extra low pressure (XLP) reverse osmosis membrane provides high-performance water treatment for commercial applications. Proudly manufactured in the United States by Hydrocomponents & Technologies Inc. (HCTI), this element is designed to seamlessly drop into standard 4-inch by 21-inch pressure vessels. It utilizes advanced thin-film composite technology to deliver superior filtration efficiency that matches or exceeds standard industry specifications. By operating effectively at a reduced feed pressure of just 100 PSI, this HCTI membrane minimizes the energy consumption of high-pressure booster pumps while maximizing system throughput, making it a highly cost-effective solution for reducing overall facility electrical expenses.

This American-made element is built for consistency and durability, delivering a reliable nominal permeate flow rate of 1,000 gallons per day (GPD). With a stabilized salt rejection rate of 99.00%, it provides robust removal of total dissolved solids (TDS) and other common contaminants, ensuring dependable water quality for commercial RO setups. Whether used in small-scale commercial purification or as part of a multi-stage industrial system, this high-quality compatible alternative from HCTI is designed to maintain consistent output even under variable feed water conditions, offering a dependable balance of high flux and stringent, energy-efficient purification.