Hydranautics Nitto – RO Membranes – Energy Saving Polyamide – ESPA2 – ESPA2 MAX

We ship to
Please login or register to see downloads


Combining energy efficiency with high rejection

The energy required to pressurize RO feed water is the largest contributor to the total energy consumption of the RO plant. ESPA membranes are the choice for applications demanding high-energy efficiency, with uncompromised productivity and salt rejection. Operating at significantly lower pressures, ESPA elements produce high quality water in a range of water treatment applications, ensuring energy cost savings.

ESPA membranes are used in the treatment of drinking water, industrial process waters, municipal and industrial waste water recovery and reuse because of this exception performance capability. These membranes also serve as part of polishing units in seawater desalination plants when boron rejection is critical.

ESPA2 membranes provide optimum salt rejection and permeate flows. They are chosen when lower permeate TDS and lower feed pressures are needed. ESPA2 membranes offer highest energy efficiency at lowest costs and are used in large municipal wastewater reclamation plants.

ESPAB are low pressure brackish water membranes having a high rejection for boron.

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

The ESPA2 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 membranes offer consistently low feed pressures and longer intervals between cleanings.

ESPA2 and ESPAB 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 membranes which have a membrane area of 440 ft2 (40.9 m2) and use 34 mil feed spacer.





Looking for downloads for this product? Follow the two simple steps below.

Step 1
LoginorCreate Account
Step 2

View downloads!



Manufacturer Hydranautics Nitto
Series Energy Saving Polyamide
Model Number ESPA2
Part Number ESPA2 MAX
Description Diameter - 8"
Length - 40"
Permeate Flow - 12,000 gpd
Salt Rejection - 99.6%
Test Conditions -
1500 ppm NaCl solution
150 psig Applied Pressure
77 F Operating Temperature
15% Permeate Recovery
6.5 - 7.0 pH Range

Click To Schedule a Service Call

Click To Schedule a Sales Call

Call for a FREE Quote Today

(855) 787-4200