I just changed my spa water, got the pH right, added a pH stabilizer and everything was smooth and hunky dory. As soon as I added about 4 ounces of liquid calcium hardener, the spa got cloudy and stayed that way. Upon checking, the hardness level was still well below where it "should" be. (Even though I knew I needed more hardener, I thought I mighta somehow screwed up and added too much, but not so). I called my regular guy who was not available, so I went to a local spa outlet that usually offers good advice. She advised continuing to bring the hardness level up to proper specs (all I had at that point - after using up the liquid I had from 3 months ago -- was new stuff, in solid crystal-ly looking form (not powder -- so I went ahead and added more), then use a clarifier and then do a good thorough cleaning of the filter (3 months old, with no problems with clarity to this point). She believed strongly that there was a reaction between the pH stabilizer & the calcium hardener. Did as she advised, then added the clarifier, waited overnight, the water was still as thick as pea soup (only white instead of green " title="Wink" /> so I decided to drain the tub again. As it drained to where I could see the bottom portions of the tub I could clearly see that none of the calcium had dissolved. Please bear in mind when you reply to this question that the original cloudiness rapidly appeared as I added *liquified* calcium hardener -- in fact, it precipitated immediately before my eyes. So, I don't think that the use of a solid had much overall efect -- the water was already very cloudy... this morning, however, in a sample, there was definitely floating precipitate. So I guess the question is -- do you think there is a reaction between the pH stabilizer and the calcium as the spa lady said? I also read online on another forum that hardener additives were not advised if using a pH stabilizer, but no reason why was given, nor were subsequent consequences denoted. Any help or advice would be appreciated. Thanks!

"I also read online on another forum that hardener additives were not advised if using a pH stabilizer, but no reason why was given, nor were subsequent consequences denoted."

Because you'll wind up with water that looks EXACTLY like yours.