PrimoChill PCLUBT-CLR Liquid Utopia Offers Full Line Protection Against Algae and Corrosion Environmentally Responsible, Safe, and Non Toxic Product Protects Ferrous and Non-Ferrous Metals From Corrosion Safe on All Plastics, Rubbers, and Miscellaneous Gasket Materials, Including Acrylic. Can be used in new install(recommended) or existing loops.