EasyPro Pond dyes help filter out UV rays from the sun. Choose from industry original blue, the increasingly popular black or “Serenity” a combination of the blue and black. Concentrated formula - use one ounce per 1000 gallons of water! Does not stain or harm fish, plants or other wildlife once dispersed in water. Pond dyes help filter out UV rays from the sun. Gives pond water a deep reflective appearance. Blue dye gives water a “Caribbean Blue” look. Black dye gives a more “reflective” look. Serenity dye is a blackish-blue combination pond dye.