Commercial RO Membrane — 400 GPD 4x14"
SKU 37-0023Or 4 interest-free payments — see options at checkout.
- Founded 1985
- Built in Tempe AZ
- In-house membranes
- Lifetime support
Hand-tested 400 GPD commercial RO membrane in a 4" × 14" form factor, built for lab and commercial-grade systems where 99% rejection is the baseline expectation. Each membrane is individually tested for high rejection before shipping.
Features
- Stabilized salt rejection: 99%
- Minimum rejection: 98%
- 4" diameter × 14" length commercial form factor
- Hand-tested for lab-grade rejection performance
- No serial number (hand-tested batch process)
Specs
- Production: 400 GPD ±20% at 60 psi
- Test conditions: 250 ppm softened water, 77°F (25°C), 15% recovery
- Dimensions: 4" × 14"
- Replace when rejection drops below 96% or production slows (not from cold water)
Pair with the correct flow restrictor. Always change the flow restrictor when changing membrane size. Pre-filter maintenance and feed water chemistry have an outsized impact on lab membrane life — keep pre-filters fresh and log TDS to get the full lifespan.
Related products
- Larger commercial: 1000 GPD 4×21" · 2500 GPD 4×40" Low Pressure · 2500 GPD 4×40" High Pressure
- Browse the full RO membrane lineup
Questions about filters, production rates, or membranes? Visit our Know Your Filters page or contact us.
Cleaner water for plants, pets, and people
Reverse osmosis membranes reject microplastics, PFAS and "forever chemicals," chlorine and chloramine byproducts, heavy metals, and the dissolved solids that show up as taste and scale. That means cleaner feed water for your plants, animals, business, or family — and a lot less reliance on bottled water, which keeps plastic out of the landfill. Most setups run a 3:1 waste-to-product ratio on hard water and 2:1 on soft water, and can be tuned to 1:1 in high-purity feed areas or with a periodic pure-water flush. The system is built to last with field-serviceable filter housings, so you replace cartridges (not whole units) for years of dependable purity.