Good point; if that actually produced a usable product, at the very least it would have to be prepared and stored in a high-pressure environment... can't be truly anhydrous. Guess it's not true then.... does that mean using baked magnesium sulfate to draw the water out of "pure" acetone for meth washes actually leaves some H2O behind and carries off some of your meth with it...? Guess it's one source of the loss.