Twilight Blue Pond Dye maintains a neutral blackish-blue tint that is ideal for shading and protecting your pond without making drastic changes to natural pond appearance. 1 gallon of regular strength pond dye treats up to 1 acre, 4-6 feet deep. Twilight Blue Pond Dye Plus combines our color enhancing pond dyes with water clarifying Liquid PondClear beneficial bacteria for the ultimate 1-2 punch. Beautify and protect your pond from troublesome UV sunlight with long-lasting natural shades of pond dye while eliminating suspended organic debris that contributes to cloudy water, muck accumulation and weed growth. Fish, Plant & Wildlife Friendly When used in accordance with label directions Pond Dye Plus is completely safe for your fish, plants, pets and pond wildlife.