Why CYA is lost


Active member
Feb 27, 2011
I can't seem to maintain my stabilizer. I finally got most of the other chemistry in line, but have been running with a high pH. I know the hot Az sun is part of the reason, but going from 80 to 20 or below, adding > a galon of liquid stabilizer, then repeating the process the next week, dosen't sound right. do I just need solid cya once my levels are right? how much of this stuff should I expect to go through this summer?

(I'm sure there is a compete write up on this, but I could find it in the search.)


Well-known member
Mar 16, 2011
Sunny Central Florida
I don't know, I lose a lot too. When I started BBB, my CYA was only 90, and I had been using exclusively tabs for years. I've been BBing for a little over a year now, after the first 6/8 months it got down to 30, and now I put 8-10 tabs in the thing every other month to get it from 20ish to 30/40.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
The most common causes of CYA going down are splash out, backwashing, and leaks. It is also fairly common for CYA to disappear over the winter.