Hygienic Toilet Blocks clean, foam, and freshen the toilet bowl with every flush leaving a delicate fragrance. The blocks sanitise and colour the water whilst helping to reduce limescale. Long Lasting - Fights odours and dirt around the clock Safe with any cleaner or bleaches use in the bowl Harmless with all types of plumbing and septic tanks Biodegradable - Safe for the environment. 2in1 cleans & freshens. Cleans, freshens, colours & foams. Breez.