After reading so many accounts of mist coolant systems "filling the shop with the mist/fog" and then actually using one; I just don't see how it happens unless the thing is just running wide open at 90 psi? I use mine on the surface grinder, and only have it on when needed, and adjusted so it's barely spraying. Also keep the nozzle as close the wheel/workpiece contact as possible. Most of the mist immediately condenses on the work on contact. In an hour or two of grinding, it uses maybe a coffee cup worth of coolant. My shop is 16'x32' and 14' ceilings. That's a lot of cubic feet for 6-8 oz of liquid to "fill it with fog". Keeps the workpiece nice and cool, and I don't notice that I'm breathing anything foreign. Can't even smell the stuff. Frankly, I don't see what all the fuss is about.