EarthBio FOGfighter 12oz concentrate for sprayer to treat drains for fats, oils, and grease . Mix concentrate with water in 1-gallon sprayer for proper ratio to treat floor drains. FOG formula applied directly to drains will help reduce odors and maintain free-flowing drain lines. Daily spraying of floor drains will improve biological remediation of grease build up and reduce floor drain clogging over time. FOGfighter 12oz concentrate comes in cases of 6.