California Code of Regulations (Cal. Code Reg.): Title 22 – Social Security > Cal. Code Reg. §65525. Recirculation and Water Treatment System Operation.
(a) The pool operator shall operate pumps, filters, disinfectant and chemical feeders, flow indicators, gauges, recirculation systems, disinfection systems, and all parts of the water treatment system whenever the public pool is available for use and at such additional times as necessary to maintain clean pool water, clear pool water, and the disinfection standards required in section 65529.
(b) The variation in flow rate of an operating recirculation system shall be such as not to reduce the flow below 75 percent of the rate required in section 3124B, Title 24, California Code of Regulations.