Quote Originally Posted by CarlD View Post
Balance Pak 300 = Calcium Carbonate (basically, what's in Tums.)
Actually, according to this MSDS, Balance Pak 300 is calcium chloride, not calcium carbonate (which does not dissolve very quickly except in acid). It's the same as Peladow (90% calcium chloride) and similar to Dowflake (68% calcium chloride).