ESPA® Hydranautics Membranes

Ultra Low Pressure Brackish Water Reverse Osmosis Elements

ESPA (Energy Saving Polyamide) elements achieve high flux/lower pressure without compromising standards for high rejection. Since its introduction in the late 1990's, the ESPA membrane has gained wide acceptance in the water treatment industry due to the significant operational cost savings associated with their use.

Advantages

99.6% Nominal Rejection
Lower pressure for lower CAPEX/OPEX

Applications

Municipal potable and wastewater plants
Bottling Operations
Light Industrial

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. Industrial users worldwide have made ESPA their first choice for high productivity and salt rejection. There's an ESPA solution to satisfy even the most challenging water treatment needs with exceptional performance, productivity and savings.

ESPA1 - The world's leading high productivity, energy-saving polyamide membrane.
ESPA2 - Combines high productivity, energy savings and less salt passage all in one element
ESPA2-LD - has minimized biofouling, minimized colloidal fouling and enhanced cleanability
ESPA2 MAX - Offers the same rejection characteristics as ESPA2 but with even higher flow rates
ESPA4 - Highest productivity & rejection with next-generation performance

Hydranautics ESPA Membranes
Hydranautics Membrane ESPA

Model No. (Click for spec. sheet)	Flow Rate*		Pressure Rating (PSI)	Nominal *Salt Rejection %**	*Minimum Salt Rejection %**	Size* (Dia. x L)		Spec.
Model No. (Click for spec. sheet)	(GPD)	(m3/d)	Pressure Rating (PSI)	Nominal *Salt Rejection %**	*Minimum Salt Rejection %**	Size* (Dia. x L)		Spec.
ESPA-2514	150	0.56	150	99.4	98.0	2.5" x 14"
ESPA-2521	350	1.3	150	99.4	98.0	2.5" x 21"
ESPA-2540	750	2.8	150	99.4	98.0	2.5" x 40"
ESPA-4014	500	1.9	150	99.4	98.0	4" x 14"
ESPA-4021	1,000	3.8	150	99.4	98.0	4" x 21"
ESPA1-4040	2,600	9.8	150	99.3	99.0	4" x 40"
ESPA2-4040	1,900	7.2	150	99.6	99.4	4" x 40"
ESPA2-LD-4040	2,000	7.6	150	99.6	99.4	4" x 40"
ESPA4-4040	2,500	9.5	100	99.2	99.0	4" x 40"
ESPA1	12,000	45.4	150	99.3	99.0	8" x 40"
ESPA2	9,000	34.1	150	99.6	99.5	8" x 40"
ESPA2-LD	10,000	37.9	150	99.6	99.5	8" x 40"
ESPA2MAX	12,000	45.4	150	99.6	99.5	8" x 40"
ESPA4	12,000	45.4	100	99.2	99.0	8" x 40"
Model No. (Click for spec. sheet)	Flow Rate*		Pressure Rating (PSI)	Nominal *Salt Rejection %**	*Minimum Salt Rejection %**	Average Boron Rejection* (% @ 10 PSI)	Size (Dia. x L)	Spec.
Model No. (Click for spec. sheet)	(GPD)	(m3/d)	Pressure Rating (PSI)	Nominal *Salt Rejection %**	*Minimum Salt Rejection %**	Average Boron Rejection* (% @ 10 PSI)	Size (Dia. x L)	Spec.
ESPAB Provides a new option for communities where boron levels are naturally high or for manufacturers challenged by boron contamination issues. ESPAB MAX Increased active surface area for higher flux and rejection, with the same superior boron rejection as the ESPAB.
ESPAB	8,600	32.6	150	99.2	99.0	96.0	8" × 40"
ESPAB MAX	9,000	34.1	150	99.3	99.0	96.0	8" × 40"

*Please see product specification sheets for the test conditions under which the stated performance are based, and exact membrane element dimensions.
Click the model number to download the data sheet for that element.

Obsolete ESPA Membrane Models

The below Hydranautics ESPA Membrane Models are Obsolete and are no longer available for purchase. The below information is being listed for reference and replacement purposes only.

Model No. (Click for spec. sheet)	Flow Rate (GPD)	Press. Rating (PSI)	Minimum Salt Rejection %	Size (Dia. x L)
ESPA1 - The world's leading high productivity, energy-saving polyamide membrane.
ESPA1-2540 Not Available. Use M-B2540AHF	750	150	99.0	2.5" × 40"
ESPA1-4014 Not Available. Use M-B4014AHF	500	150	99.0	4" × 14"
ESPA1-4021 Not Available. Use M-B4021AHF	1,000	150	99.0	4" × 21"

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