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Anonymous
Roughly somewhere between 5 and 30 minutes, depending on how much and how effective the chemical(s) put into the pool are and whether or not they are safe to swim in immdiately after they're mixed with the pool water.
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You should wait a minimum of about 20 min.
You do not add pH to a pool - it does not exhist as a product.
NO! it is highly recommended you don't it could kill you or get you very sick