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My pool is approx. 20,000 gal. Had it drained and cleaned last spring after five years. The CYA seemed to measure very high after the company drained it. Thinking this guy may have put excessive stabalizer in it. Now it’s so high I can’t even measure.I use liquid chlorine and 2- 4 pucks a...

My CYA IS 90-100. Pool is approx. 17500 gals . Any idea how much to drain to get the cya down to the 50 range. Pool was completely drained back in April.