Bog Fog - Extreme High Density Fog Juice - HDF Fog Machine Fluid - 4 Gallon Case - Best Rated and Best Seller - Water Based, American Made and Just Plain Awesome Fog The Most Extreme High Density Fog Fluid on the market - HDF Water Based Fog Juice Ideal for "Lots of Fog", The Best Outdoor Ground Fog when used with a Fog Chiller, Vsual Obscurity, "fog-out" or "white-out" conditions, and simulated smoke training Designed For Use With Any Water Based Fog Machine - Optimized for machines with 700 watts and higher Remains Clean, Dry, Odorless and Leaves Little to No Residue or Contamination, Non-irritating, Non-toxic, Non-flammable 100% American Made - Froggys Fog only uses De-Ionized Water and Pharmaceutical Grade Chemicals, all Approved by the FDA.