It does exactly what the advertising says it does. It alters the surface tension of the water so that terrible smell does not escape into the air of your home.
Had to keep sniffing to make sure I was not imagining there was no hint of odour! I have a fantastic sense of smell. Not a good thing when the loo is right next to the dining/living area. Problem solved.
Just for once the advertising is spot on, the product matches the description