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JB13 wrote: 99.9% is the purity, not the dilution. You can have 70/30 dilution and still have 99.9% pure DMSO. I don't think adding distilled water to reduce the concentration is considered an impurity.
Here is the label on one of my bottles of DMSO.
In other words, in the bottle is 99.9% (pure 100% DMSO) + 1% water = 100 % total solution in bottle.
I have a bottle of DMSO from WPS4SALE. It says 99.9% Pure. But the dilution is 70/30 (which is all they sell) even though it does not state so on the bottle. You should check with the company you bought the DMSO from.
Recall that MMS2 % of calcium hypochlorite commonly varies from ~58% to ~73%. The rest are impurities.