Pond Logic 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 contribute to cloudy water, muck accumulation and weed growth. Twilight Blue maintains a neutral blackish-blue tint that is ideal for shading and protecting your pond without making drastic changes to natural pond coloring. Safe for swimming, fishing, wildlife and domestic animals. 1 Gallon treats up to 1 acre with an average depth of 4-6 feet deep. Apply once every 4-6 weeks or as needed. Not for use in small water features or water gardens.