SKU: 25375443465

4" x 40" | 2350 GPD | 100 psi | 99.2% Rej. | Hydranautics ESPA Ultra-Low Pressure Membrane (Replaces ESPA4-4040)

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Description

4" x 40" | 2350 GPD | 100 psi | 99.2% Rej. | Hydranautics ESPA Ultra-Low Pressure Membrane (Replaces ESPA4-4040)Hydranautics ESPA4 LD 4040 4" x 40" Membrane Element Combining energy efficiency with high rejection Hydranautics ESPA4 LD 4040 is the lowest feed pressure membranes offering low energy consumption. ESPA4 LD 4040 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 LD 4040 membrane is designed with Low differential (LD) Technology to minimize


Hydranautics ESPA4-LD-4040 4" x 40" Membrane Element

Combining energy efficiency with high rejection


Hydranautics ESPA4-LD-4040 is the lowest feed pressure membranes offering low energy consumption. ESPA4-LD-4040 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-LD-4040 membrane is designed with Low differential (LD) Technology to minimize colloidal fouling when used with conventional pre-treatment equipment. Hydranautics ESPA4-LD membranes offer consistently low feed pressures and longer intervals between cleanings.

ESPA4-LD-4040 is the replacement for Hydranautics ESPA4-4040 membrane element, which has been discontinued by the manufacturer.

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.

ESPA4-LD-4040 Specifications

Manufacturer Model: ESPA4-LD-4040
Brand: Hydranautics Nitto
Replaces Model: Hydranautics ESPA4-4040
Permeate Flow: 2,350 gpd (8.9m3/day)
Salt Rejection: 99.2% (99.0% Minimum)
Test Feed Pressure: 100 psi (0.7 MPa)
Test Temperature: 77°F (25°C)
Test Recovery: 15%
Test pH Range: 6.5 to 7.0 pH
Test Feed: 500 ppm NaCl Solution
Configuration: Spiral Wound
Membrane Polymer: Composite Polyamide
Membrane Active Area: 80 ft2 (7.4 m2)
Feed Spacer: 34 mil (0.864 mm)


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Exchange/Return Notes
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SKU: 25375443465

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4.1 ★★★★★
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Verified Purchase
Jess
Pawtucket, US
★★★★★ 4
Nice
Size: 2' x 3' (Natural shape, Sheepksin, Oblong), Color: Ivory White
Nice product! Slightly different texture than anticipated
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 1, 2025
C
Verified Purchase
Christy
Lowell, US
★★★★★ 1
Inaccurate color description
Size: 2' x 3' (Natural shape, Sheepksin, Oblong), Color: Ivory White
Color is not ivory white… Very yellow!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
T
Verified Purchase
Tani M.
Dallas, US
★★★★★ 5
Is super soft and works for elderly
Size: 2' x 3' (Natural shape, Sheepksin, Oblong), Color: Ivory White
My mom has been ill and confined to her recliner for sleeping. She developed pressure sores and was in a great deal of pain. We needed to treat the sores and I researched how to prevent in first place and found that genuine sheepskin helps. I had no idea this was a thing. I ordered this for her recliner and a seat one for the car. She loves this. She said she could feel an immediate difference in sitting for so long that she didn't need to shift constantly. I don't understand the mechanics behind why this works but I'm grateful for something natural and affordable like this to offer such relief.
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Reviewed in the United States on June 26, 2025
Verified Purchase
龍気
Port Orchard, US
★★★★★ 5
Photo of the color differences for you!
Size: 2' x 3' (Natural shape, Sheepksin, Oblong), Color: Ivory White, Size: 2' x 3' (Natural shape, Sheepksin, Oblong), Color: Ivory White
The white one seems softer than the cream one!? Seems like great value for your money for a single pelt, the seller and product didn’t seem sketchy at all.
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Reviewed in the United States on January 25, 2026
M
Verified Purchase
Moe
Chelsea, US
★★★★★ 5
Nice
Size: 2' x 3' (Natural shape, Sheepksin, Oblong), Color: Ivory White
Worth it
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Reviewed in the United States on January 1, 2026

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