I mix 7 oz. with water to make a gallon of stock solution, then the students take one oz. of the stock to make a gallon of working solution. Very strange stuff.
Contains OCTYLPHENOXYPOLYETHOXYETHANOL, which according to the MSDS, does not sound too bad (keep it out of the eyes and the concentrate off the skin.) Also, POLYETHYLENE GLYCOL -- I assume that is the PG you referred to.