NF System Recovery & Concentrate Calculator | Blue Membrane

NF System Recovery & Concentrate Calculator

Estimate permeate quality, concentrate hardness, and antiscalant requirements for your NF softening system design.

Feed Water Hardness (mg/L as CaCO₃)

Feed Water TDS (mg/L)

System Recovery (%)

NF Rejection Rate (%)

Calculation Results

Permeate Hardness

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Concentrate Hardness

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Permeate TDS

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Concentrate TDS

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Concentration Factor

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Hardness Removal

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Design Notes

Warning: At recovery above 75%, CaCO₃ and CaSO₄ scaling risk increases significantly. Standard antiscalant dosing (2–4 mg/L) controls scaling for most groundwater systems at up to 75–80% recovery. Feed LSI should be calculated using actual temperature and pH; contact Blue Membrane engineering for a site-specific antiscalant recommendation. Permeate TDS estimate assumes monovalent pass-through proportional to recovery.