Generally, when the water is below 60 you are OK--but you still should add polyquat and shock it. Most people close when there isn't ANY hope of swimming again and the water's gotten too cold--into the 60's.
Re: When to close??
Generally, when the water is below 60 you are OK--but you still should add polyquat and shock it. Most people close when there isn't ANY hope of swimming again and the water's gotten too cold--into the 60's.
Carl
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