CrystalClear Vanish Plus will immediately remove chlorine, chloramines and heavy metals that are often present in city water supplies. Vanish Plus will also add a slime coat protectant to the water to help fish heal wounds and abrasions while protecting them in times of stress such as during water changes and clean-outs. Safe for fish, domestic animals and aquatic plants. Use is water gardens and small ponds. 1 ounce will treat 200 gallons. For new ponds fish and plants can be added 20 minutes after water has been added.