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Wow some really bad advice on hear. Some folks need to stop listening to old wives tales. Yellow must defently does work. Second yellow out does not "suck chlorine" its an acid that destroys the membrane of an organic. When you have a cac derived from heavy organic load switching to liquid means nothing. Nor does the amount of chlorine added over a couple weeks. When this happens you need yo add any fast acting chlorine ie:shock consistantly over a 24 hour period. Checking cya is a good thing. As for the statement they are going to tell you to drain your pool is silly.