u should invest in a kalk reactor best piece of equiptment i ever bought the one i have is from precision marine cost 250.00 u put one or two scoops in the reactor get a digital timer and mix for 15 mins 3 times a day.the kalk is always super saturated and it always doses the clear liquid i dode it at one dpop per second and it replaces all evaporated water.if u go with with the stir method make sure only dose the clear liquid not the powder.i would say about 2 nice scoops per 5 gal the ajust accordingly.