GreenClean Blue Colorant Concentrate - 16 oz - For Koi Ponds and Water Features. Safe for Fish, Plants, Pets and Wildlife. Mixes quickly and evenly at all water temperatures Built-in dosing cup for easy application Non-toxic and food grade Non-staining to aquatic life Treats up to 17,000 gallons Greenclean blue colorant Increases water quality and enhances water clarity Creates a barrier against the sun's UV rays Can be used all season as a preventative treatment Measures 15-inch width by 4.5-inch height by 11.5-inch depth