Bio-Production BB1 Biological Urinal Toss Blocks contain special bacterial cultures that clean and deodorise urinal traps and pipes while enabling great savings of water to be made. Bio-Production BB1 Biological Urinal Toss Blocks Features: - Whilst we do not advocate waterless urinal systems, a typical urinal need only be flushed about three times each day when using Bio Blocks. - Formulated active cleaning agents into a safer, less environmentally damaging water-soluble urinal block that maintains clean, odour-free urinal-traps and pipes. - Each time the urinal is used, water softening and cleaning agents are delivered into the trap to clean and maintain the pipe-work to prevent odours and blockages. - Bio Blocks do not contain carcinogenic pDCB or other harmful or dangerous chemicals and are particularly suitable for use in public buildings such as hotels, pubs, clubs and restaurants as well as schools and institutions where care should be taken to protect people and the envi