CYA loss

[lborne]

I seem to be loosing CYA a lot more quickly than salt. For this year I have added no salt and it has dropped from about 3500 to 3000 since January. In the same time frame I have had to add 90 ppm of CYA to keep my 60-70 level.

Is there anything other than splashout, backwash and heavy rain overflow that can cause CYA to drop?

 

[jparr]

I've had the same issue, CYA just vanishes, and does so faster than the salt. My pool is fine otherwise, always clear.

 

[JasonLion]

CYA can sometimes go away during periods when FC is zero, though this is fairly uncommon.