That depends on the type of charcoal filter. Standard charcoal filters are disposable, while long life and long-life HP (high performance) filters last for 3 years and, for proper maintenance, should be washed every 2-3 months in the dishwasher at 65,° or by hand with warm water and neutral detergent and then dried in the oven for 10 minutes at 100°. To learn more, download our charcoal filter Buying guide at the following link: https://shop.elica.com/it/guida-filtri.html