Biokleen Bac-Out Drain Care Combines The Latest Technology Of Enzymes With Natural Live Cultures For The Ultimate Drain Care And Maintenance. Enzymes Work To Break Down Grease, Fats And Other Matter Into A Food Source The Cultures Eat And Then Digest Safely Into Minerals, Water And Oxygen. This Synergistic Blend Works Together, Unlike Enzyme- Only Based Products, And Is Crucial In Eliminating The Source Completely For Treatment And Maintenance Of Slow Drains.