Rid-Metals can be termed a heavy metal eradicator - water conditioner that instantly detoxifies elements such as lead, copper, zinc, and other heavy metals from freshwater and saltwater When the amino acid found in Rid-Metals bonds with metal ions, a complex is formed that effectively binds the heavy metals - insuring that they cannot react with any other ions in the aquarium or pond. Easy to dispense, Rid-Metals removes up to 10-times more heavy metals than other similar products. Good mechanical filtration combined with regular water changes with gravel vacuum-type cleaning removes these inactive heavy metal compounds. 16 oz