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The Hydranautics ESPA2-4040 is a high-performance, energy-saving reverse osmosis (RO) membrane element designed specifically for brackish water applications. As part of the world-renowned ESPA (Energy Saving Polyamide) family, this 4-inch element is engineered to deliver a superior balance of high permeate flux and exceptional salt rejection while operating at significantly lower pressures than standard brackish water membranes. This performance profile translates directly into reduced energy consumption and lower operational costs for water treatment facilities.

Crafted with a specialized polyamide thin-film composite, the ESPA2-4040 is an ideal choice for municipal potable water plants, industrial process water systems, and bottling operations. It provides a nominal salt rejection rate of 99.6%, ensuring the removal of dissolved solids, silica, and other contaminants to produce high-purity water. Its robust spiral-wound design is built for durability and long-term stability, making it a reliable standard for light industrial and commercial RO systems worldwide.