Microbe-Lift Bio-Black Enzymes & Pond Colorant Microbe-Lift/Bio-Black can save the life of your fish. Predators like mink, herons, and coons are not able to see you fish in black water saves time and money! Does 2 jobs with a single application. Safely colors water and blocks out algae causing UV rays. Safe - Non Toxic - Non-Pathogenic Easy to use, Biodegradable, Once diluted, will not stain birds or fish, nor most concrete fountains or pond rocks. Safe for humans, plants and aquatic life. Safely colors water a beautiful shade of black. Blocks out specific light rays. Digests organic waste, Reduces noxious odors. Mixes completely in hours. Dye breaks down in 6-8 weeks.