API 237ml Aqua EssentialSize: 237ml API Aqua Essentials is a highly concentrated all in one aquarium water conditioner. It prepares water for aquarium use, removing chlorine, chloramines, and heavy metals from tap water, and instantly detoxifying ammonia, nitrite, and nitrate. Use when setting up an aquarium, after water changes, and when ammonia, nitrite, and nitrate are detectable with a test kit. Dosage: Easy to use, the dosing cap included on the bottle. Use 5ml per 38