Many facilities are considering no-water urinals because they are regarded as an effective way to conserve water. Water must be pumped by electricity, some estimate that as much as $300 per year per urinal can be saved in utility costs. The installation of no-water urinals can help buildings achieve credits toward Leadership in Energy and Environmental Design (LEED) certification. Basically, a no-water urinal works the same way as a conventional urinal, except without the water. No-water urinals are cleaned in much the same way as conventional urinals. However, some models are designed to facilitate cleaning because they have a smoother interior "skin" or surface than what is found on a conventional urinal. There are some drawbacks when switching to a no-water system. For instance, the cylinders used in some no-water urinals can be expensive and may need to be changed more frequently than originally thought. This may eliminate any savings a facility hoped to realize. Additionally, some facilities with few urinals, low water usage, or low sewer or water costs may not benefit by installing no-water urinals--especially if existing conventional urinals still are useful.