I started dosing Kalwasser due to the apparent fact that you get healthier and faster growing corals when in the 8.2-8.5 PH level. So with my 200 liter tank I am currently dosing 30 ml of Kalwasser top off water per hour. Been doing it just 3 days. Tested this morning and PH has increased from 7.9 to 8.25. I have not tested this evening yet but the corals tell me plenty. Fast growth and more polyp extension than before.