4 Function Formula (with patented technology) 1 Cleaning Foam cleans the toilet with every flush. 2 Dirt Protection helps to prevent resoiling. 3 Extra Freshness gives a long lasting fresh scent in the bathroom. 4 Anti-Limescale formulation helps prevent limescale forming. Bloo Blue Active is an innovative rim block which combines design and function in one. Combining power balls and blue water technology, actively cleaning between flushes. A hygienically clean and fresh toilet with every flush! (safe for septic tanks)