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Suggested CYA levels

I have a question:  If we put CYA in pools to protect chlorine from degradation, and suggest levels of 30-50 ppm in a "regular" chlorinated pool that gets dosed weekly (assuming a pool man in servicing the pool), why does the CYA level increase to 60

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Foam-like in Pool

 

After adding citric acid to a pool the pool surface became cover with sort of foam.

I’m guessing that it may be related to chemical reaction between the citric acid and the sodium carbonate present in the pool. Has anyone have a similar experience? F

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