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air release algaecides alkalinity allow around the pool backwash bacteria black algae bleach blowback bottom outlet brush bulb calcium carbonate calcium hypochlorite cartridges caulking cause cement check valve clean clock clogged coat color copper cover cracks cyanuric acid D.E. filter element Diatomaceous Earth diatomite dirt diving board drain dry chlorine dust electric electric conduit empty epoxy fiberglass filled filter powder filter tank filtered water filtration fitting flow of water FUNGUS gallons galvanized steel garden hose GAS HEATERS gasket gate valve gauge gravel green algae ground water heater hole horsepower hydraulic cement impeller inch latex leak leaves and trash life-line liquid manganese manifold Natural gas operation paint roller Phenol Red pilot light piscina plaster plastic liner Polvo pool acid pool bottom pool chemicals pool filter pool light pool owners pool paint pool piping pool pump pool shell pool surface pool wall pool water pounds pressure pressure filter pumice pump motor pump strainer reagent removed replaced rinsed rock garden sand filter Sandblasting sanitation short circuit siphon skimmer soda ash sodium hypochlorite stainless steel stains steel wool strainer basket suction sump sump pump surface tension swimming pool switch Synthetic rubberized Tank Top test tube tile turned usually vacuum cleaner vacuum hose vacuum valve volts wash waste valve water conditioner weak acid