Douglas County Rules and Regulations for Swimming Pools - Cobb ...

Part 14 Sand Filtersa.) Appurtenances. E ach filter tank shall have an access port for inspection and servicing.Each filter shall have both influent and effluent pressure gauges with a minimum face size oftwo inches ( 2”). The f ilter s ystem s hall ha ve an ade quately s ized, i n-line ba ckwash s ightglass on t he b ackwash line. All a ppurtenances shall be c onspicuously located f or qui ckinspection.b.) Piping and valves. The f iltering s ystem s hall be de signed with all va lves a nd pipingrequired that allows filtering to pool, filtering to waste, filter bypass to waste, and completedrainage of the system. The piping layout shall accommodate proper maintenance, operationand inspection.Part 15 Diatomaceous Earth Filtersa.) Filter tank and septa. The filter area shall be determined on the basis of effective filteringsurfaces, w ith no allowance given for areas o f i mpaired filtration, such as br oad s upports,folds or portions which may bridge the filter elements. T he bottom of open vacuum filtertanks shall slope to a drain to facilitate complete drainage of the tanks.b.) Appurtenances. Pressure filters shall be equipped with an air-relief valve, influent andeffluent pressure gauges with a minimum face size of two inches (2”), and an in-line sightglass on the backwash line. A vacuum gauge with a minimum face size of two inches (2”)shall be provided on t he pump suction line for vacuum filter systems. All appurtenancesshall be conspicuously located for quick inspection.c.) Piping and valves. The filtering system shall be designed with all valves and pipingthat a llows filtering t o pool, pr e-coat r ecirculation a nd/or pr e-coat t o waste, completedrainage of t he s ystem, bypass f ilter t o waste, and ba ckwashing t o w aste. T he pi pinglayout s hall a ccommodate pr oper m aintenance, ope ration and i nspection. If p re-coatrecirculation is used in a pressure system, an in-line sight glass, minimum two inches (2”)in length, and a valve shall be provided in the pre-coat piping.Part 16 Cartridge Filtersa.) Appurtenances. E ach filter shall be equipped with influent and effluent pressure gaugeswith a m inimum f ace s ize of t wo i nches ( 2”). All a ppurtenances s hall be c onspicuouslylocated for quick inspection.b.) Piping and valves. T he filtering system shall be designed with valves and piping thatallows filtering to pool, bypass filter to waste, and complete drainage of the system. Thepiping layout shall accommodate proper maintenance, operation and inspection.c.) Cartridges. Two (2) sets of cartridges shall be provided so that one set may be cleanedCobb and Douglas County Public HealthDouglas Rules and Regs for Swimming Pools24