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Thanks and I am glad to have a collective of so much help!! I test at Leslie’s and they changed to a fancy new test with one dropper of water. Sadly, I went from perfect water in early April (CYA of 40) to out of control (165) in July. I am guilty of being heavy handed with shock but I am in...

I have a 12k gallon pebble tec in Chandler AZ. CYA is 165 and I have to drain it. Temps daytime 110+ but at night in the 80’s. I want to start at 10 PM and drain 5-6 hours. Cleaning walls as I go, I will refill with 3 hoses and it should take 4 hours so back on business by 8 am when it still low...

CYA is over 150 In a 12000 gallon pebble tec pool. I have drained overnight once before but it’s been hot recently. I know I can start at 10 pm and drain by 3 or 4 am, clean walls as I go and then fill with 3 hoses— full by noon. Is this safe and what are the temp cutoffs I should be aware of...