Weco Instant De-Chlor Water ConditionerWeco DeChlor instantly eliminates chlorine and reduces toxicity of common heavy metals, making tap water safe for your aquarium fish. Just 1 drop per U. S. gallon removes chlorine and chlorine dioxide. Instantly eliminates chlorine REduces toxicity of heavy metals Safe to use in saltwater or marine aquariums that utilize protein skimmers or foam fractionators Will not cause foaming DeChlor also reduces the toxicity of heavy metals such as copper,