With a CYA of 40, chlorine of 5ppm is not at shock level. Shock level would be 15ppm. See the Best Guess Chart here for the connection between CYA and chlorine. http://pool9.net/cl-cya/
Re: Dead possoms in skimmer basket need help please
With a CYA of 40, chlorine of 5ppm is not at shock level. Shock level would be 15ppm. See the Best Guess Chart here for the connection between CYA and chlorine. http://pool9.net/cl-cya/
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