im no expert, but I stayed at a holdiay inn...
actually I read the chem forum a lot.
Randy says its not important how much you put in, any extra will settle once it reaches saturation. Use a powerhead on a timer 5 min/day and it seems pretty easy.
I've been using a kalkreactor, but I think I'm gonna switch> Its probably me, but the kalk usage seems to vary quite a bit without me touching anything.