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adequate backwash bather load bathers chlorine cleaning components CORROSION RESISTANT MATERIALS Data plates deck Department depth design and construction design flow rate device diatomaceous earth discharge disinfecting diving boards drain effective filter area exceed face piping feeder filter aid filter cycle filter media filter tank filtration filtration rate GPM per square head loss horsepower inches inches of mercury inlet Institute-National Sanitation Foundation instructions Insulating fittings located maintenance manufacturer manufacturer's maximum media filter minimum motor National Sanitation Foundation National Swimming Pool normal Ordinance outlet overflow performance permit PIPING MATERIALS Pool Equipment Standards Pool Institute-National Sanitation pressure filter public pools public swimming pool pump recirculation system requirements residential pools residential swimming pools Sanitation Foundation Standard SEALING DEVICES Section septum skimmer housing slope slurry Sodium Chloride square foot strainer surface skimmers Swimming Pool Equipment SWIMMING POOL INSTITUTE Swimming Pool Institute-National vacuum vacuum cleaning valves velocity vertical wall weir