Toss Blocks / Bio Blocks The original biological urinal blocks. Toss Blocks contain special bacterial cultures that clean and deodorise urinal traps and pipes while enabling great savings of water to be made. Whilst we do not advocate waterless urinals a typical urinal need only be flushed about 3 times each day when using Toss Blocks. The pictures show two urinal outlets after 6 months use - one using Toss Blocks the other no blocks. Toss Blocks do not contain pDCB or other dangerous chemicals and are particularly suitable for use in public buildings schools institutions hotels pubs clubs and restaurants etc especially when used with Blu-Away. Product code: TB1 BB