Fryer Oil Filter Powders can either be added directly into the oil in the fryer or you can use them in a filter machine. They help prevent oil breakdown at high temperatures. They also act as a filter aid during the oil filtration process. Add inedible deep fryer powders like Magnesol to a frying oil filter machine. During filtration, the effective particles in Magnesol powder act as a magnet and remove food debris. Magnesol also removes soluble liquid impurities which contribute to off flavors and odors.