Almost makes we wonder if the tabs could be combined with salt to make them stable for use. It would be nice to be able to rotate like 3 different tabs----one with calcium, one with cya, and one with salt to be able to keep using them and balance your levels as needed. I guess that being combined with something totally inert is out of the question. Almost makes we wonder if the chemical companies do this on purpose to keep you buying even more chemicals to "fix" your problems. That wouldn't exactly be a first, now would it?