"coolant" from the machines.... from what they say but its pretty much whatever falls into the drains and wash down water. but when ever that farm next door has a crop growing and the wind is blowing it gets all over their crops and they are a so called "organic" field but the soil over there gets OWNED by that shit and I mean OWNED! so I feel sorry for who ever buys that crop and I'm suprised that the EPA hasn't been out there to shut it down or fine them for that cause its just nasty! but I've been told if you tried to swim across the width of the pond that you would probably die before you got to the other side cause of how many chemicals are in that shit...