Why tote and store big, bulky one-gallon jugs when you can get the job done with a tiny little quart? Prairie Ridge Aquatics Blue Lake Dye is a super-concentrated organic colorant designed to create a deep, rich blue color in your pond. Each one-quart bottle will treat an entire surface acre, up to 6 feet deep. For best results, add to multiple spots around the edges of the pond, or use in conjunction with aeration. Repeat monthly or as needed. Will not stain fish, plants or other wildlife when used as directed.