Cannot raise CYA

[Big Splash]

I needed to add a cup of Klean Strip Green Muriatic acid to lower my pH. Don't know if this could effect my CYA level or not but thought I'd throw it out there just to be safe.

Don't know if this is part of your issue, but I wouldn't use the brand "Klean Strip Green Muriatic acid". There's no amount of concentration labeled and it has unknown / unwanted additives to make it "safer" (a.k.a. not safe for pools).

http://www.homedepot.com/p/Klean-Str...5006/202690263