ESPA2 reverse osmosis membranes provide optimum salt rejection and permeate flows. They are chosen when lower permeate TDS and lower feed pressures are needed. ESPA2 reverse osmosis membranes offer highest energy efficiency at lowest costs and are used in large municipal wastewater reclamation plants. ESPAB are low pressure brackish water reverse osmosis membranes having a high rejection for boron.

ESPA2-LD reverse osmosis membrane is available in diameters of 4.0 and 8.0 inches.

The ESPA2 reverse osmosis membranes are available in the LD variant. Low differential LD Technology® models are offered to minimize colloidal fouling when used with conventional pre-treatment equipment. These reverse osmosis membranes offer consistently low feed pressures and longer intervals between cleanings. ESPA2 and ESPAB  reverse osmosis membranes are available in the MAX variant with 440 ft2 (40.9 m2) active membrane surface area. Increased membrane area reduces capital costs by requiring fewer pressure vessels and less floor space.

Innovations have enabled us to offer the ESPA2-LD MAX reverse osmosis membranes which have a membrane area of 440 ft2 (40.9 m2) and use 34 mil feed spacer.