I had many problems with that salt in the tanks that I take care of at a pet store. This was when I first started out with saltwater. I had problems such as PH, CAL, ETC... I heard that this type of salt mix was a lower grade salt. So I switched, and have not had a problem one. I use a brand called aquavitro. This is a $$$ brand of salt. Somewhere around $85.00 for 250gal, but it's been the best salt I used. Now I use there whole line of products. There easy to use, and have not had one problem. This Is a 10 out of 10 porduct.