Just wanting to find out what your advice is. I am continually trying to lower my pH. I bought an HTH product called pH minus but in less than a week, i've used more the whole jug (7lb). I am thinking of buying a 50lb bag of sodium metabisulfite as this HTH is over 20 dollars per bottle here in this jungle town, but have read that maybe this is not a good idea? I have no access to Muriatic Acid as I live in a "Red Zone" for cocaine production. Also, is dry acid going to mess up my salt water chlorine generator as it contains sulfur? I don't know what other option I have.