This tokk some getting used to for my cats as they have always used clay litter, but once they were used to the smell and feeling they are using all the time. The crystals absorb the urine and smell so easily. If you look closely you will see a difference in color for the crystals that have been urinated on amd those that are still fresh. The litter lasts a lot longer than clay litter, so it doesn't need to be changed as often, with 3 cats it is a life saver!