Water purifying and treatment chemicals for spas, hot tubs, swim spas, cold plunges, and baths, namely, water chlorinating and brominating chemicals, and slime removers for water, balancers for adjusting and buffering pH, total alkalinity, and hardness of water, non-chlorine shock treatments for oxidizing water contaminants, clarifiers for reacting with organic contaminants in water, preventing scum lines, filter clogging and cloudiness in water, foam reducers for water, stain controllers, namely sequestering agents for preventing staining, scale, and rust in water from depositing on pool equipment, pipes and fittings, water softening agents, initial and maintenance use products for salt spas