This pond dye is perfect whether you plan to have fishing, swimming, pets or animals around your pond and is safe for all the creatures who might be in or near the water. This is a great choice if having a beautiful blue pond is something your heart desires! A half gallon of this dye treats up to one acre of water. Pour each half gallon at several points around your pond and in just a matter of hours it will begin to spread through the pond to give you that beautiful blue color. A safe choice for your pond or lake.