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Home – Home – Membrane Grade Selector Membrane Grade SelectorMatch your feed water to the right Blue Membrane RO / NF grade. Feed water Select feed water… Low-TDS tap / pure-water feed (<1,500 mg/L) Brackish / well water (~2,000–10,000 mg/L) Seawater (~32,000 mg/L) Wastewater reuse / high-fouling Softening / food & beverage (retain minerals) Priority Balanced Maximum rejection Energy-efficient / higher flux Recommend a grade Select a feed water to see a recommendation. Stabilized salt rejection Average flux Test solution Test pressure Standardized single-element values at 25 °C, pH 7–8. Confirm against your actual feed chemistry, pressure and recovery. Request a quote for →