I dose kalk through my BM doser to keep my ph constant 8.3 and also to lessen how much 2 part I use. I end up dosing 1500 ml of kalk split up 24 times, I have been doing this for 2 months now and has been great but can't comment on long term effect on the pump or clogging, but in the 2 months it has been solid so at max if maintenance on the set up was cleaning it every 2 months that's not to bad. I love kalk in an ato but my setup now uses a float valve which is way too sketchy to use with kalk. So now I dose kalk and the ATo float valve pick up The remaining evap. I Use the other two pumps to dose 2 part still but in much lesser amount.