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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.
