Bloo Acticlean Cistern Blocks 2 x 38gKeep your toilet thoroughly clean and fresh with Bloo's 3 simple ranges. 1 Protect. Our in cistern range cleans, protects and helps prevent limescale build up from the toilet cistern to the bowl. 2 Freshen. Our pioneering ball design and patented technology ensures a fresh and clean toilet bowl after every flush. 3 Shine. Our liquid toilet cleaner cleans the bowl, removes limescale & leaves a long lasting fragrance. Lasts us to 8 weeks, Cleans & foams