I am thinking about dosing kalkwasser also known as pickling lime, but was wondering how often I should dose. Should I only dose a day or two out of a week when my calcium is low or will it hurt my tank if I dose on and off.
You typically dose daily, normally small volumes early in the morning. The trick with Kalk, it is more for maintaining Ca rather than increasing it. You really can't bump low Ca with Kalk. You are limited the the amount of Kalk you can add in a given time due to the pH swing and the precipitation. Thus small daily dosages are standard operating procedure unless you do not have as much demand to require that level of additional Ca
I use between a half gallon and a gallon per day, as my top off on 150 gallon system, works just fine. If my evaporation goes above that, I use plain RODI..You can do it manually, or set an ATO. I think consistentcy is the key