We purchased a new home with a pool last summer. We are first time pool owners. The previous owner used puck chlorine tablets (left a couple large tubs full), but when I purchased the testing kit the CYA was super high, like off the meter, estimated ~300. After a few significant water exchanges we had it down to 58 and proceeded from there using liquid chlorine instead. I was expecting to lower it a bit further when partially draining for winter and replacing this spring. However, when opening now and adding water (~15% replacement), the CYA levels measure below 30 (dot still visible when the tube was full).
Other numbers were roughly where I expected based on last year numbers except for chlorine which had essentially disappeared over winter. FC/CC at 0 (at SLAM at time of closing), PH at 7.8 (maybe slightly lower), TA 180, CH 260.
The reagents were stored inside in a cool, dark, climate controlled location. Is it possible for the reagent to go bad (shows a Sept 2020 date on the bottles)? Is there anything that would otherwise cause the CYA to drop from last fall to this spring, I thought only water exchange would do that and the amount of water I replaced should have been far less than enough to drop it more than in half?
I'm a newbie, so thanks for any assistance.
Other numbers were roughly where I expected based on last year numbers except for chlorine which had essentially disappeared over winter. FC/CC at 0 (at SLAM at time of closing), PH at 7.8 (maybe slightly lower), TA 180, CH 260.
The reagents were stored inside in a cool, dark, climate controlled location. Is it possible for the reagent to go bad (shows a Sept 2020 date on the bottles)? Is there anything that would otherwise cause the CYA to drop from last fall to this spring, I thought only water exchange would do that and the amount of water I replaced should have been far less than enough to drop it more than in half?
I'm a newbie, so thanks for any assistance.
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