Chlorine- CYA vs non-CYA ?

[CarlD]

Greetings--

I use granular non-stablized cholrine added by hand on a routine basis. WHen we go out of town, I add stablized tabs to a Hayward offline feeder. I've noticed that the CYA levels are climbing. End of season last year the level was around 90+ .

Q??-- Does someone make non-stablized tabs ?

Q??-- I realize that a high CYA level causes a loss of sanatizing power from the chlorine. Any other problems caused by high CYA levels (> 100) ?

32000g vinyl lined pool.

Thanks !

The only non-stabilized powdered or stick chlorine is Cal-hypo, which adds calcium to your water. A little is OK, too much is a problem. Stick Cal-hypo can either be wrapped in plastic and 68% chlorine (good) or unwrapped and 48% chlorine (garbage, and dissolves in less than 12 hours).

If your CYA is greater than 100, you need to maintain chlorine levels of 8 to 15ppm normally, and, when you need to shock, push it to 25ppm.