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RO recovery & brine flow

Permeate / reject split for a reverse-osmosis system at a given recovery, plus reject concentration factor.

Permeate flow
7.5m³/h
= 2.08 L/s·125 L/min·33 US gpm
Reject (brine) flow
2.5m³/h
= 0.69 L/s·41.7 L/min·11 US gpm
Concentration factor
4×
Within the typical brackish-RO range (50–80 %).
Reject TDS (estimated)
3,200mg/L
Assuming 100 % salt rejection — conservative.
Daily permeate volume
150,000L / day
= 150 kL
Daily reject volume
50,000L / day
= 50 kL
RO recovery specification
At 10 m³/h feed and 75 % recovery, the system produces 7.5 m³/h permeate and 2.5 m³/h reject. Running 20 h/day delivers 150 kL/day of treated water. Reject TDS rises to ≈ 3,200 mg/L (CF = 4×).

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