Water purifying and treatment chemicals for swimming pools, spas, and hot tubs, namely, chlorine, lithium and bromine water chemicals, slime removers for water, balancers for adjusting and buffering ph, total alkalinity and hardness of water, chlorine and non-chlorine shock treatments for oxidizing water contaminates, clarifiers for agglomerating particles suspended in water to facilitate filtering, reacting with organic contaminates in water, preventing scum lines, filter clogging and cloudiness in water, and preventing floating and diving insects from gathering on a water surface, coagulating agents for precipitating floating debris and unfilterable material in water, foam reducer for water, stabilizers for stabilizing chlorinated water against attack by sunlight, stain controllers, namely, sequestering agents for preventing staining, scale and rust in water from depositing on pool equipment, pipes and fittings, chemically treated non-medical test strips for testing the ph, alkalinity, chlorine, lithium or bromine concentration in water, water treatment kits comprising water purifying and treatment chemicals and test strips for controlling and testing the ph, alkalinity, chlorine, lithium or bromine in swimming pools, spas and hot tubs, and test kits comprising water purifying and treatment chemicals and test strips for controlling and testing the ph, alkalinity, chlorine, lithium or bromine in swimming pools, spas and hot tubs