OBSCZONER Well-Known Member Joined Jan 20, 2011 Messages 137 Reaction score 2 Location 916 Oct 9, 2011 #1 i recently moved. i found a box in the garage that had a bag of DME in it. The DME is Rock Hard. is it still useable? i can buy more but in these hard times no need to if not neccesary. ? thanks.