Unique internationally patented Oleoclean technology. This deep fryer is unique because it filters the oil completely automatically. Once the food is fried, switch off the fryer and turn the dial to the automatic filtration position. As the oil cools, it drains through the sieve into the storage container. The oil is always clean, and can be used multiple times. Since the oil is filtered after each use, it lasts longer. Monitoring the frying process is easy.