The feeds that are eaten and not eaten by the birds remain in the feeder. It is difficult to blow out the feeds that are mixed and distributed by the birds. Manufactured in wood, it also has a powerful fan and two feed compartments. When you pour the feed mixed by your birds into the machine, the uneaten feed is poured into the first cleaning chamber and the crusts left from the feed that are eaten in the first cleaning chamber are poured into the second cleaning chamber. Oats and derivative products cannot be eliminated.