BioHygiene Bio Blocks utilises specialist microbial technology to clean and maintain urinal pipework. The fast-acting formula quickly breaks down and removes organic scale whilst odour removing technology combats odours at the source for long-lasting odour protection. Specialist biotechnology provides residual protection against odours and scale build-up. Suitable for all types of urinals and troughs. Naturally derived, sustainable ingredients minimise harm to our aquatic ecosystem. Free from harmful chemicals.