I use AquaSafe too. It works fine, but I've been wondering lately if there's a more economical choice... as in, one that goes farther (use less). It seems that with as many tanks as I have up, I buy AquaSafe a bit more often than I like. I dunno, maybe cost-wise, they all work out about the same. Any opinions based on personal experience as to whether some water conditioners are more economical than others? Maybe I should try to find larger quantities online. (just kind of thinking out loud now)