How much CYA to add to go from 30 to 40?


Active member
May 14, 2019
Scottsdale, AZ
Hi, I feel like my CYA is getting a bit low at 30 (it's been gradually going down over the last few months; I use liquid chlorine only and muriatic acid to control ph.)

So I bought some stabilizer. I'm just wondering how much to add to go from 30 to 40 in a 20,000 gallon pebbletec pool? I don't want to over do it. Thanks!


Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
Bedford, TX

28 oz of dry stabilizer (CYA) will add 10 ppm of CYA to a 20K pool..

That is what Pool Math does for you, you should try it..


Jim R.


Gold Supporter
LifeTime Supporter
Jul 16, 2010
Portland, Oregon
If you plug the numbers into the browser/web page version of Pool Math, you'll get a dry volume results so you don't have to weigh it. But, it's usually very close so balparking can work.