Mardel Coppersafe solution contain chelated copper sulfate. Recommended for the treatment of ick (ichthyophthirius multifillis), chilodinella, trichodina, gyrodcactylus flukes, anchor worms and other external parasites. A unique stabilized form of chelated copper is designed to maintain a therapeutic level of copper that is safe for fish but effective against parasites. Invertebrates must be removed before treatment begins. It may also be harmful to plants and some snails. Coppersafe does not color the water and will not interfere with the biological filter. Use 1 teaspoon (5ml) for each 4 gallons of aquarium water. Treats water for approximately 1 month. This product weighs 1-gallon.