I dose RHF's DIY as well - but I don't put it into water, but rather add it dry to my tank every day. For my system, a heaping tea spoon of excel snow melt, and heaping tea spoon of baked baking soda in by the skimmer every day does the trick. I've dosed Kalk a few times - to get alk up, from a 2 liter tuperware jug with a drip line coming out about an inch up from the bottom. Even after letting the solution settle for a day, the line clogs or has build up over a few doses. Never tried the dosing pump route but would think for the price, they wouldn't clog easily.