Quote Originally Posted by iVgOnMaD View Post
Did you by any chance start using Phosban media or any other GFO products like Rowaphos?

These can drop your alkalinity if not added slowly.
Why does that occur? also if it is just pH and not alk would the GFO cause that also? I'm experiencing the same thing and thinking of doing a kalk drip or reactor, I just havn't seen anything on a kalk reactor.