If you don't like a smelly toilet, why would your cat? Litter Fresh by Cat H2O is a easy & lazy way to control the smelly litter box. Whenever your cat leaves the litter box, it automatically spray a fine layer of mist over the litter surface, Litter Fresh Deodoriser break down the smell at the molecule level. It’s 100% odourless, non masking. Cat H2O is proud to have worked with PDD Design of the UK.