In my 20 gallon tank I do 5 scoops of kalkwasser stir in 5 gallon jug and dose it with a x1 kamoer dosing pump. Works great and I am even dosing even more alkalinity to boost it because corals are growing mad. Works grade I love the PH boost from kalk. I started with tropic marine all in one then moved to 2 part couldn’t balance it well. Moved on to kalkwasser and used 2 part then found calcium to be really high so now just use kalk and alk. Kalk stays pretty steady. I started with 3 scoops of powder. Slowly increased to 5 scoops of kalk. 1 per gallon as stuff grew. Everything super happy.