Hydranautics

ESPA-2521 Hydranautics Nitto Membranes

Name: ESPA-2521 Hydranautics Nitto Membranes
Brand: Hydranautics
Price: 164.33 USD
Availability: InStock

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PLEASE REFERENCE DATA SHEET AND TABLE BELOW

Hydranautics ESPA-2521 Energy Saving RO Membrane Element (2.5" x 21")

The Hydranautics ESPA-2521 is a high-efficiency Reverse Osmosis (RO) membrane element designed for compact commercial and point-of-use systems where energy consumption is a primary concern. Belonging to the Energy Saving Polyamide (ESPA) series, this membrane delivers high salt rejection while requiring significantly lower operating pressure than conventional RO membranes.

The 2.5-inch diameter by 21-inch length configuration is standard for small commercial or specialty applications, offering a nominal permeate flow of 350 GPD. This element operates optimally at just 150 psi, allowing systems to utilize smaller, lower-power pumps. Constructed with a composite polyamide, the ESPA-2521 maintains excellent water quality, achieving a nominal salt rejection rate of 99.5% for brackish water sources.

SPECIFICATION	DETAILS	NOTES
Model Number	ESPA-2521	Smallest diameter element in the ESPA series.
Manufacturer	Hydranautics (Nitto)	Energy Saving Polyamide (ESPA) technology.
Membrane Type	Reverse Osmosis (RO)	Low pressure, high rejection.
Nominal Permeate Flow	350 GPD (2.5 $\text{m}^3/\text{d}$ )	Nominal flow at $150 \text{ psi}$ test pressure.
Nominal Rejection ( $\text{NaCl}$ )	99.5% (Min 99.0%)	High salt rejection at ultra-low pressure.
Test Conditions	1,500 ppm NaCl, 150 psi, $77^\circ\text{F}$	Standard conditions for the ESPA series.
Active Area	$19 \text{ft}^2$ (1.8 $\text{m}^2$ )	Active membrane surface area.
Element Size	2.5 in D x 21 in L	Standard size for commercial housing.
Max Applied Pressure	600 psi (4.14 MPa)	Maximum limit for continuous operation.

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Model #	Diameter x Length	GPD	Rejection	Typical Pressure
ESPA-2521	2.5 x 21	350	98%	150

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ESPA-2521 Hydranautics Nitto Membranes