ESPA (Energy Saving Polyamide)
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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.
ESPA1 membrane has the same chemistry as the ESPA2 membrane but has a higher permeability. ESPA1 membrane requires even lower feed pressures than ESPA2 and the energy consumption is also lower.
ESPA1 is popularly used in the treatment of low TDS waters to produce potable water.
ESPA1 membrane is available in diameters of 4.0 and 8.0 inches. The 4.0 inch diameter membrane is available in Low Differential LD ™ technology. See ESPA2-LD membrane page for more information on the LD features and benefits.
| Product Name | Size | Download |
| ESPA1-LD-4040 | 4″ diameter & 40″ length |  |
| ESPA1 | 8″ diameter & 40″ length | |
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.
ESPA4 are the lowest feed pressure membranes offering low energy consumption. ESPA4 membranes require ultra-low pressures without compromising high salt rejection and are commonly used in the second pass of a reverse osmosis system.
The ESPA4 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.
ESPA4-LD HP are high flux membranes offering low energy consumption without compromising on high rejection. These membranes have an active membrane area of 400 ft2 (37.2 m2), 34 mil brine spacer thickness, and high pressure construction for operation up to 1200 psi (8.27 MPa) to allow greater concentration of feed solution.
ESPA4 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.
| Product Name | Size | Download |
| ESPA4-LD-4040 | 4″ diameter & 40″ length | |
| ESPA4-LD | 8″ diameter & 40″ length | |
| ESPA4-LD HP | 8″ diameter & 40″ length | |
| ESPA4 MAX | 8″ diameter & 40″ length | |