Hydranautics

ESPA-4021 Hydranautics Nitto Membranes

$253.23 USD

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Hydranautics ESPA-4021 Energy Saving RO Membrane Element

The Hydranautics ESPA-4021 is a high-performance Reverse Osmosis (RO) membrane element designed for significant energy savings in commercial and light industrial applications. Part of the highly successful Energy Saving Polyamide (ESPA) series, this element provides exceptional salt rejection while operating at ultra-low pressures.

The 4-inch by 21-inch configuration is ideal for smaller systems, delivering a nominal permeate flow of 1,000 GPD at a low applied pressure of just 150 psi. This low-pressure requirement directly translates to lower energy consumption and reduced operational costs compared to standard brackish water RO membranes. The ESPA-4021 maintains high water quality, achieving a nominal salt rejection rate of 99.5% for brackish water sources.

Technical Specifications Summary

SPECIFICATION	DETAILS
Model Number	ESPA-4021
Manufacturer	Hydranautics (Nitto)
Membrane Type	Reverse Osmosis (RO), Energy Saving
Membrane Polymer	Composite Polyamide
Nominal Permeate Flow	1,000 GPD (4.9 $\text{m}^3/\text{d}$ )
Nominal Rejection ( $\text{NaCl}$ )	99.5% (Min 99.0%)
Test Conditions	1,500 ppm NaCl, 150 psi, $77^\circ\text{F}$
Active Area	$38 \text{ft}^2$ (3.5 $\text{m}^2$ )
Element Size	4.0 in D x 21 in L
Max Applied Pressure	600 psi (4.14 MPa)
Max Operating Temp	$113^\circ\text{F}$ ( $45^\circ\text{C}$ )
Feed Spacer Thickness	34 mil (0.86 mm)

Model #	Diameter x Length	GPD	Rejection	Typical Pressure
ESPA-4021	4.0 x 21	1,000	99.0%	150

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ESPA-4021 Hydranautics Nitto Membranes