Pool Turnover Rate and Chlorine Demand
Required pump flow from pool volume and turnover target, plus the chlorine product to dose a free-chlorine target (cal-hypo / trichlor / liquid bleach). Per the NSPF CPO Handbook and ANSI/APSP/ICC 11.
Formula and source
Required flow (GPM) = pool volume / (turnover hours x 60). Chlorine product (lb) = volume x ppm x 8.34 / 1,000,000 / available-chlorine fraction (cal-hypo 0.65, trichlor 0.90, liquid bleach 0.125).
NSPF Certified Pool Operator Handbook (2022); ANSI/APSP/ICC 11 (Public Pools and Spas).
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