FritzZyme 360 is a powerful probiotic blend of naturally occurring environmentally friendly live heterotrophic bacteria capable of digesting organic sludge common in aquariums. Sludge includes fish waste leftover food and other decaying organic matter. Using FritzZyme 360 as part of a regular maintenance program will greatly reduce aquarium care including gravel vacuuming water changes as well as prolonging filter media life. Promotes a clean clear and healthy aquarium Reduces and simplifies maintenance Bacteria rapidly digest waste Eliminates foul odors Improves flow through filters Initial dose Use 1 tsp 5 ml per 5 US gallons 19 L. Maintenance dosing Use 1 tsp 5 ml per 10 gallons 38 L. Shake well add directly to aquarium in an area of high flow to allow product to circulate. Turn off UV sterilizers for 48 hours after application. NOTE An earthy odor is normal a natural result of biological activity. Odor will quickly dissipate when adding product to aquarium. Color variation is normal.