Package Includes: (4) Gallons of Chauvet HDF High Density Fog Juice ---------- The Chauvet HDF is an exceptional value! This high density fog juice is specifically formulated for use in all water based haze and fog machines. The unit produces a thicker, denser smoke than the original HJU, and leaves no stains or residue. Not only that, but it is non-toxic, non-flammable, and unscented. CHAUVET fluids are designed and tested to provide exceptional output from CHAUVET fog, snow, and bubble machines. Play it safe and get maximum output by relying on CHAUVET fluids.