LG Chen LG-BW-4021-UES RO Membrane NSF-Certified Extremely Low Pressure Compatible Element by SpiroPure

Name: LG Chen LG-BW-4021-UES RO Membrane NSF-Certified Extremely Low Pressure Compatible Element by SpiroPure
Brand: SpiroPure
SKU: 943146154
Price: 126.87 USD
Availability: InStock
Rating: 5.0 (1 reviews)

SP-XL4021
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Product Overview
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The SpiroPure SP-XL4021 Extremely Low-Pressure Commercial Reverse Osmosis Membrane Replacement 4 x 21 is a high quality extra-low energy replacement membrane filter cartridge. The SP-XL4021 low pressure membrane provides optimal RO filtration performance at very low feed pressures for low energy consumption and extra savings on operating costs.

Extremely Low-Pressure XLP RO Membrane Specifications:

Nominal Size: 4" x 21"
Certification: NSF 61 certified
Salt Rejection Rate: 98.5%
Average Permeate ±15%: 950 GPD @ 100 PSI
Feedwater NaCl: 500 ppm
Fresh Water Recovery Rate: 8%
Feed Spacer: 28 mm
Maximum Recommended NaCl: <2,000 ppm
Maximum Operating Pressure 600 PSI

XLP-4021 Extreme Low Energy Membrane common applications:

Commercial water treatment systems
Low salinity brackish water
Smaller water treatment systems
Whole house RO systems
Food service
Medical and research institutions
Hospitality industry
Drinking water
Wastewater reuse
Car washes
Agricultural
Irrigation

XLE-4021 Extremely Low Pressure Membrane compatible element model numbers:

XE1-4021
Dupont Filmtec XLE-4021
LG Chem LG BW 4021 UES

FAQs on 4021 Commercial RO Membranes

What is a 4021 low pressure RO membrane?

A 4021 low pressure RO membrane is a 4" x 21" reverse osmosis element engineered to filter effectively at reduced feed pressures. The SpiroPure SP-XL4021 is an Extremely Low-Pressure membrane, delivering strong performance while using less energy than standard commercial membranes.

How many gallons per day does the SpiroPure SP-XL4021 produce?

The SpiroPure SP-XL4021 produces an average permeate output of 950 GPD (±15%) at 100 PSI, tested against 500 ppm feedwater NaCl. Actual output may vary somewhat based on your system's real feed water quality, temperature, and operating pressure. Pre-filtration protects the membrane from clogging or premature fouling that can lessen production and longevity.

Is the SP-XL4021 suitable for commercial RO systems?

Yes. The SP-XL4021 is designed for commercial water treatment systems, including food service, hospitality, medical and research institutions, car washes, and wastewater reuse applications. Its low-pressure operation also makes it a practical fit for smaller commercial and, when practical, whole-house RO systems.

How can I find the best 4021 RO membrane price?

If you're sourcing your replacement 4021 membrane through an industry supplier, you may be paying a markup for a brand-name OEM filter, like a FilmTec XLE-4021, that costs more without outperforming a compatible alternative. Compare the SpiroPure SP-XL4021 price here: same 4" x 21" fit, 98.5% salt rejection, and extremely low-pressure operation, at a lower cost.

What is the salt rejection rate of the SpiroPure SP-XL4021 membrane?

The SpiroPure SP-XL4021 is an extra low pressure membrane with a salt rejection rate of 98.5%, tested under standard lab conditions. It's rated for feedwater up to 2,000 ppm NaCl maximum, making it well suited for low-salinity brackish water and municipal or tap water sources.

Can I replace a FilmTec XLE-4021 with SpiroPure SP-XL4021?

Yes. The SpiroPure SP-XL4021 is manufactured as a compatible replacement for the Dupont Filmtec XLE-4021, matching its 4" x 21" size and low-pressure performance specifications. Always confirm your system's pressure vessel dimensions before ordering to ensure proper fit.

Displaying Reviews 1-1 of 1

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1 out of 1 people found this review helpful.

Fast, Reliable and affordable

By Male in 60s and over from Fort Stockton, TX on 7/1/2025 7:54:49AM

Great service. Delivered ahead of schedule. Recommend to all

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