Brightwell Aquatics Erase-Cl - Chloramine Chlorine and Ammonia Remover 500ml / 17oz : Overview Removes chloramines, chlorine, ammonia, and nitrites present in tap water and/or aquarium water. May be used to neutralize iodine in the event of an aquarium overdose. Used as directed, is safe for use directly in all marine aquaria, including reef aquaria. Free of phosphate and silicate. Formulated by a marine scientist. If concentrations of ammonia or nitrite are persistently-measurable with a quality test kit, test the source water (i.e. tap water or water from the purification unit (if applicable)) for these substances.