Healthy Ponds 52014 Pond Water Colorant, Blue, 5 x 5 Ounce Water Soluble Bags, Treats up to 2.5 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 Five 5-ounce water soluble bags treat up to 2.5 Million gallons Simply toss water soluble bag into the water from the shore