Api tap water conditoner treatment removes toxins from tap water instantly, so you can add fish to your aquarium or add them back after a water change immediately. It dechlorinates aquarium and tap water, detoxifies heavy metals, and may be used in both fresh and salt water.. Instructions. Use dosing cap on bottle. To remove chlorine and detoxify heavy metals: add 1ml for each 10 u.S. Gallons 38l of tap water to be added to the aquarium. To detoxify chloramines: add 5ml for each 30 u.S. Gallons 114l of tap water.