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Hydranautics Membrane Elements
Hydranautics 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 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.

  • Up to 99.6% Nominal Rejection
  • Lower pressure for lower CAPEX/OPEX
  • High Productivity
  • Longer Membrane Life due to Low Biological and Colloidal Fouling
  • Higher rejection for impurities including Silica and Boron
  • Greater Tolerance to High pH Cleaning

ESPA1 Series Hydranautics RO Membrane Elements

High Productivity, energy saving reverse osmosis membranes.

Model No.

Size
(Dia.”× Length”)

Flow Rate

Test Pressure (psi)

Nominal Salt Rejection (%)

Minimum Salt Rejection (%)

gpd

m³/d

ESPA-2514

2.5” × 14”

250

0.9

150

99.4

98.0

ESPA-2521

2.5” × 21”

350

1.3

150

99.4

98.0

ESPA-2540

2.5” × 40”

750

2.8

150

99.4

98.0

ESPA-4014

4” × 14”

500

1.9

150

99.4

98.0

ESPA-4021

4” × 21”

1,000

3.8

150

99.4

98.0

ESPA1-LD-4040

4” × 40”

2,450

9.27

150

99.4

99.2

ESPA1

8” × 40”

12,000

45.4

150

99.3

99.0

 

ESPA2 Series Hydranautics RO Membrane Elements

ESPA2 product family offers new technology for higher productivity and rejection; minimizes bio-fouling & colloidal fouling and features and enhanced cleanability.  The ESPA2 MAX features increased surface area for higher permeate production.

Model No.

Size
(Dia.”× Length”)

Flow Rate

Test Pressure (psi)

Nominal Salt Rejection (%)

Minimum Salt Rejection (%)

gpd

m³/d

ESPA2-LD-4040

4” × 40”

2,000

7.6

150

99.6

99.4

ESPA2

8” × 40”

9,000

34.1

150

99.6

99.5

ESPA2-LD

8” × 40”

10,000

37.9

150

99.6

99.5

ESPA2MAX

8” × 40”

12,000

45.4

150

99.6

99.5

 

ESPA3 Series Hydranautics RO Membrane Elements

ESPA3 Series membrane elements offer the highest product water flow rates of the Hydranautics ESPA family of membrane elements.

Model No.

Size
(Dia.”× Length”)

Flow Rate

Test Pressure (psi)

Nominal Salt Rejection (%)

Minimum Salt Rejection (%)

gpd

m³/d

ESPA3-4040

4” × 40”

3,000

11.4

150

98.5

98.0

 

ESPA4 Series Hydranautics RO Membrane Elements

ESPA 4 Series membrane elements feature a lower operating pressure, resulting in lower operating costs, while maintaining high productivity and a minimum salt rejection of 99%.

Model No.

Size
(Dia.”× Length”)

Flow Rate

Test Pressure (psi)

Nominal Salt Rejection (%)

Minimum Salt Rejection (%)

gpd

m³/d

ESPA4-LD-4040

4” × 40”

2,500

9.5

100

99.2

99.0

ESPA4

8” × 40”

12,000

45.4

100

99.2

99.0

ESPA4-LD

8” × 40”

12,000

45.4

100

99.2

99.0

ESPA4MAX

8” × 40”

13,200

50.0

100

99.2

99.0

 

ESPAB Series Boron Removal Hydranautics RO Membrane Elements

ESPA B  boron removing elements provide a new option for communities where boron levels are naturally high or for manufacturers challenged by boron contamination issues.

Model No.

Size
(Dia.”× Length”)

Flow Rate

Test Pressure (psi)

Salt Rejection (%)

Ave. Boron Rej. (%@10psi)

gpd

m³/d

Nominal

Minimum

ESPABMAX

8” × 40”

9,000

34.1

150

99.3

99

99.6

Please see product specification sheets for the test conditions under which the stated performance are based, and exact membrane element dimensions.

Hydranautics ESPA RO Membrane Elements

Hydranautics ESPA RO Membrane Elements

  • Enhanced Membrane Chemistry for Increased Chemical Resistance
  • Innovative Spacer Design to Minimize Trapping of Small Colloidal Particles
  • HYDRAblock Technology Providing Biostatic Properties to Minimize Proliferation of Biological Fouling
  • Proprietary Vented Seal Carrier to Eliminate Pressure-Shock Damage During System Startup
  • Municipal Potabale Water
  • Municipal Wastewater Plants
  • Bottling Operations
  • Light Industrial Applications

Related Products

Retired Hydranautics Membranes - ESPA Membranes Cross Reference

The below ESPA membranes have been discontinued by Hydranautics. Listed below are the manufacturing specifications of the discontnued models (for reference only) and the recommended replacements.

 

Obsolete Hydranautics Model No.

 

 

Recommended Replacement

 

 

Original (Obsolete) Hydranautics Membrane Specifications for Reference Only

Size
(Dia.”× Length”)

Flow Rate

Test Pressure (psi)

Nominal Salt Rejection (%)

gpd

m³/d

ESPA1-4040

ESPA1-LD-4040

4” × 40”

2,500

9.5

100

99.2

ESPA2-4040

ESPA2-LD-4040

4” × 40”

1,900

7.2

150

99.6

ESPA4-4040

ESPA4-LD-4040

4” × 40”

2,500

9.5

100

99.2

ESPA3

ESPA4-LD

8” × 40”

14,000

53.0

150

98.5