Check the listing for details. Concentrated Blue Pond Dye - Dry - WSP - 4 pack, standup pouch. Condition: New. Listed at 35.09 USD. The use of Blue Lake Dye Packets are safe for fish and part of an overall pond maintenance program for backyard ponds. EasyPro Blue Lake Dye will improve the appearance of pond water and help with overall water quality. Water-soluble packets can simply be tossed into the pond for easy application.Blue Lake Colorant gives a true blue color to a pondThis nontoxic and harmless pond dye is for use in pond and lakesSimply toss the water soluble packets directly into pond (use of disposable gloves recommended)Waters can be used for swimming and irrigation once product is dispersedCompatible with most aquatic algaecides and herbicidesMixes quickly in combination with aeration devicesEach water soluble packet will treat 1/3 of an acre 3′ to 4′ deepWill not stain once dispersed