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Hi there tfp :) well I finally recieved my new kit and did a sample on my 20,000 gallon swamp :( and plugged in the numbers into the pool calculator chart and it said to replace 64% of the water with new water to bring down cya level to 40. I just wanted to run this by the forum to get...

Just wanted to say this forum is awesome !!! Here we go :-D ..I have a 20k gallon IG pool/ gunite/ plaster (concrete) kidney shape with water fall/hayward 3/4hp and a hayward star clear filter and 175 sf cartridge 2" fip ...as I started the usual clean up process I unscrewed the top...