Even you buffered to the level you want but my corals were slowly STN. I think something wrong with the ingredient they put in there for making non sticky salt. Btw, my tank is recored now and I won't use any more the TMP. I thought we had only problem with TMP salt, now seem with the regular Tropic marine has had low Alk. I do not believe why you pay high end salt (money) to get a low quality.