Swan WC Forte is a ready-to-use, ecological limescale remover for periodic use. This product removes limescale deposits from toilet bowls and urinals quickly and completely. Swan WC Forte does not harm porcelain, sewer lines, or septic tanks. Do not use this product on materials that contain lime, such as marble or bluestone. Swan WC Forte is free from chlorine compounds, other halogen compounds, inorganic acids, and petroleum-based surfactants. All surfactants used in this product originate from vegetable sources. All ingredients of non-mineral origin are fully degradable.