Kalkwasser mixture: The next step in setting up the kalk stirrer is determining how much kalkwasser to add to the stirrer on a weekly basis. Saturated kalkwasser requires 2 teaspoons of kalkwasser per gallon of water. So if you are pumping 2 gallons of kalkwasser into your tank per day, your stirrer will require 4 teaspoons per day or 28 teaspoons per week of kalkwasser. I add the kakwasser to my stirrer once a week when I do my water changes.
Kalkwasser drip rate: The last step in setting up the kalk stirrer is to ensure the dosing pump is set right. If you are dosing less kalkwasser than your tank evaporates, you need to check the alkalinity levels each day and adjust the dial on the pump until you get the desired alkalinity level. If you are dosing the amount of kalkwasser that your tank evaporates each day, monitor the water level in the sump and make sure it is not rising after 24 hours. If it is, you are dosing more than the tank evaporates and you should dial it down until you are dosing just under your evaporation rate.
My tank demands more alkalinity and calcium than I can deliver using only kalkwasser (I do not evaporate enough water) so I have my kalk stirrer set to add about 90% of the evaporated water from the kalk stirrer and the remaining evaporated water is added by means of the top off float valve. I add the remaining alkalinity and calcium with a calcium reactor as described in the next step. With this setup, I never have to worry about a kalk overdose or having to add water to the system.