Kalkwasser will supersaturate to a limit of about 12.5 PH... that dosed with evaporation or for some during the lights out hours, is naturally balanced in the amounts of Ca/alk and should only help to stablize your current levels as long as you keep up on the reactors/dosers kalk saturation ph level...AND... you dose for evaporation... ONLY!!! I run a calcium and a kalkwasser reactor so with the both of them ca is generally given in a good manner for the amount calcium demand I have and with the co2 vs the kalk... a nicely balanced PH is the total benefit.