I've been using Calgon liquid several years now. You can find it at Walmart and big chain grocery stores sometimes, sometimes not. You'll have an easier time finding it in NON-metro areas where well water is the the norm. In metro areas with city water I've had a harder time finding it. It's also not a "big" seller and if they do stock it, they don't stock much of if, so it's hard to spot. It's in a white plastic container about 6 in high. Has a blue label with a rainbow on it. Hope this helps. PS: Doesn't seem to effect the TST black tank chemical I use along with it.
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