Salt water vinyl liner pool....last year I started having trouble maintaining my chlorine level. Every few days I was having to increase my run percentage on my salt cell to keep up. I figured I just had a cell beginning to go bad until I noticed the liner beginning to fade. Scramble mode kicked in and the last thing I checked was CYA. It came back 0.....
I had always read the only way to get rid of CYA was to change the water. Well, I started with a reading of 80 and very rarely add water to my pool.
I added more CYA and brought the level back up to 70.
I just opened my pool 2 days ago....crystal clear water after running for 2 days.
Water temp is 54.
I checked the CYA and it came back 0 again.
What the heck is going on?
I don't drain my pool in the winter and did not add a drop of water when I opened it.
I have a TFP test kit I am using.