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I'm draining my pool to get rid of 4 years of CYA (thanks to my pool guy) and CH buildup. I have a DE filter and I'm using the Waste option on the mulltiport valve. I closed off the skimmers so just the main drain is pulling in the water. What is weird to me is that my spa has slowly been...

Hi all, thanks in advance for any insights you can offer. As stated, my pool is 4 years old. It has been solely maintained by a pool professional and there has been a blue floating chlorinator in it the whole time. It's never been drained. I got one of the Taylor test kits and my numbers are...