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  1. jshank

    Can you shock with 6% bleach/Other suggestions for high CD?

    I can't seem to keep FC above 0.5 in my 440 gallon spa and decided try shocking it. Can you shock with 6% bleach? I've had my Divine Sinclair tub since last September and finally did the research to confirm I didn't know what I was doing when it came to water maintenance. Last month, I dumped...