Yeap actually ran the line to skimmer. You know how it is here in Soflo. Hot and AC kicking all day lol. I actually have the but i dont see anything against Kalk.Build is basically calcium carbonate. It's used as a binder of acidity, safe to use, won't impact alk. Kalkwasser? Not necessary, look at the pdf instructions for Probiotic Method, I remember it being ill advised. Best to run their balling program. Don't obsess over ph, do your best, if you can draw fresh air to skimmer, great