I really want to continue to follow the TFP/ BBB method as it has been giving me stellar results since I opened for this swim season. My question is what are the disadvantages of using dry acid over Muriatic Acid? Prior to joining the TFP website I purchased a 30 lbs. bucket of pH minus (sodium bisulfite I think?). I was just wondering if it is all that bad to use versus muriatic acid since I dropped $59 bucks on the stuff....I promise not to buy it again!