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To kill bacteria, viruses and algae. Oxidizing action also helps clear hazy pools.
Use tri-tabs in concrete or fiberglass pools, or dichlor in vinyl liner pools for mainatining a daily chlorine reading.
For regular shock-dosing over summer, use HTC chlorine granules, or try Shock n Swim which is a chlorine-free oxidiser.
Always maintain a stabiliser level of 30-50ppm in outdoor pools to maximize sanitizer efficiency.