Just installed the Aquarite in my 34,000 gal inground vinyl liner pool... Before have never had to worry about Calcium but now what i've read about saturation index i'm thinking i need it. Do I? Right now my Cal is 30, according to the calculator I'm going to have to add 57 lbs. to get to 200... do I want it that high? And my last question (for now) is where's a good place to buy it? Thanks!