Home Appliances Design Aura Cebilon Plus Water Purifier by Asst. Prof. Ömer Kamber It is more compact and filter change are very easy according to its peers. It has five filtration stages. In ordinary RO devices, filter material is usually mounted to the stable housings so hands of worker or technical services touch to their materials on the production line or technical service. Filters of the device are more hygienic according to its peers. Because there is no hand touching to their surfaces in the production line thanks to their closed housings. In the case of water leakage, it prevents flood. The device has ventilation holes in order to prevent formation of molds.