These urinal blocks contain special bacterial cultures that clean and deodorise urinal traps and pipes while enabling great savings of water to be made. A typical urinal need only be flushed about three times each day when using Bio Blocks. Bio Blocks do not contain pDCB or other dangerous, carcinogenic chemicals and are particularly suitable for use in public buildings, schools, institutions, hotels, pubs, clubs and restaurants etc, especially when used in conjunction with Blu-Away (BA).