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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.
 (GPD)
(m3/d)
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"
ESPA3
14,000
53.0
150
98.5
98.0
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.
 (GPD) (m3/d)
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 eleme
nt.


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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