The Bloo-DUO Burst Toilet Rimblock combines advanced flushing technology with a blue ocean fragrance to create a marine scent whilst wasting. With a strong foaming action that cleans the toilet bowl, and 100% anti-limescale, it will leave your bathroom cleaner for longer between deep cleans. The strong action of this great smelling toilet cleaner/blue detergent is ideal for grime ground in with hard water stains. It leaves the bowl hygienically clean and fresh. Just flip the switch on your handle every single time you flush and is automatically cleaned.