I saw in another post the JasonLion referenced temperature having an affect on CYA readings. How does that work? Upon closing last October, my pool was heated to 90 degrees and the CYA was at about 65. At opening last week the CYA is reading about 80. We have not turned on the heat pump yet and the water temp is about 62 right now. Could that explain why my readings are so different?
I have not added any CYA, the pool store that opened my pool said they got a reading of about 35 on my CYA and suggested I add some more, but my TF100 says CYA is 80...I am not going to add any more until I know for sure that I will not "overdose" my pool on it. How can they get 35 and I get 80?