Sanco Industries KoiWorx 32 Oz. Blue Dye Lake & Pond Treatment-

KoiWorx Blue water treatment produces a blue water that also provides protection for pond fish. Pond Blue can be seen through by humans but not by preying animals. It also helps to shield fish from harmful UV exposure. This blue colorant is designed for use in water gardens and koi ponds. It will not stain birds, fish, plants, pets, wildlife or people once diluted and when applied at the recommended rate. Handle with care prior to dilution to prevent blue staining. Safe for koi, goldfish, wildlife, pets, and plants. Apply 2 ounces per 300 gallons of water.