The use of Desert urinal cartridges as a substitute or retrofitted waterless urinal operating system is illegal and not approved on ZeroFlush waterless urinals. Claims by Desert that their unique urinal cartridge is reusable and can fit nearly all waterless urinal brands is fraudulent, deceptive and deceitful. The Desert urinal cartridges are only approved for use in one waterless urinal and that is the Desert No Flush urinal.