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...