結果 : does hth shock have chlorine in it
1:21

Pool shock vs. chlorine | What’s the difference?

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5:36

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0:33

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Can You Put Too Much Shock in a Pool?

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How Long Do You Have to Wait to Swim after You Shock a Pool?

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1:30

When To Use A Chlorine Free Shock? Oxi Chlorine-Free Shock Oxidizer | Clorox® Pool&Spa™

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4:57

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