I have been using PH down sold for spas (dry acid). I would like to instead use MA, but here is my issue. Everything that is sold in the stores is too large a quantity and too strong for my needs. I have a 330 gallon hot tub, so I am looking at adding in only a couple of ounces out of a gallon jug. Does anyone know if you can buy weaker MA, or smaller quantities? I don't really want to mess around with trying to pour off an ounce or two of MA out of a gallon jug, which is why I have just been using the dry stuff which quite honestly has been working fine. Once I get the tub dialed in I really only add it less than once a week, perhaps even every other week.