Healthy Ponds 52015 Pond Water Colorant, Blue, Pourable Granules, 17.6 Ounces, Treats up to 1.7 Million Gallons Pond water colorants are essential once water clarity has been achieved using healthy ponds products Shades pond and limits sunlight penetration, reducing weeds and algae; within 24 hours pond will take on a beautiful appearance that reflects the sky Safe for fish, plants, pets and humans; made from certified food quality dyes Pourable granules come in an easy-access resalable container, allowing you to scoop or pour the needed amount of dye for your pond 17.6-Ounce Jug treats up to 1.7 Million gallons