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The world's leading high productivity, energy-saving polyamide membrane


ESPA2 combines high productivity, energy savings and less salt passage all in one element


Offers the same rejection characteristics as ESPA2 but with even higher flow rates


Ideal for 2nd pass industrial applications


One of the industry's leading brackish water RO elements


Highest productivity & rejection with next-generation performance


Provides a new option for communities where boron levels are naturally high or for manufacturers challenged by boron contamination issues A New Generation of ESPA Performance

The growing family of ESPA (Energy-Saving Polyamide) RO membranes continue to meet the ever-increasing demands of the water treatment industry. Users worldwide have made ESPA their first choice for high productivity and salt rejection. ESPA1, ESPA2, and ESPA3 have long been the industry leaders, with the highest productivity and rejection available, producing up to 14,000 GPD. Hydranautics' ESPA4 low energy membrane delivers even greater productivity and rejection, now at operating pressures of less than 100 psi. Enjoy up to 250% greater productivity per membrane area compared with conventional polyamide membranes, at the lowest cost per gallon produced. Hydranautics' newer ESPA-B membranes provide 8,600 gallons per day (32.6 m3/d) of flow at 99.2% nominal salt rejection and 96% boron rejection, the new ESPA-B (B for Boron Rejection) is the highest boron rejecting, low pressure element in the industry.

There's an ESPA solution to fit even the most demanding water treatment needs now with greater performance, productivity and savings.