We have used EZ Spa for a year, ever since we bought our spa. We don't have any problems with it. I have thought about trying something else, but like the other poster said, "If it ain't broke, don't fix it." One thing about it is, we still need to use alk. up, ph up, and ph down. I thought EZ Spa was supposed to handle that, but I guess I was wrong. I do wish it would make the water feel silkier. Does anyone know of a product that will do that, that's compatible with EZ Spa? We also use chlorine for a sanitizer.