+ Don't even think about adding calcium, till you have a K2006 or equivalent (LaMotte?), and have accurate test results.

+ Like Watermom *meant*, FC + CC = TC. If CC is 0, then FC = TC.

+ Right now, the only consistent way to get out of "Restricted" status is to subscribe. That will probably change some time before summer 2012, but I don't have a definite date.