This chemcial-free toilet odour eater is effective, ecological and long-lasting. It will overcome even the most persistent odours. Hung in the toilet bowl, it works by the known reaction of high grade steel combined with water. It cleans the air of all unpleasant smells without chemicals, the result is nonstop fresh air on your WC. It is totally odourless, you will never have to change it as it is guaranteed for life. Just buy it and fit it and that's it! Diameter 5cm.