Water Filter (Passover) Status: Q. Do we need a new Brita water filter for Pesach or can we just clean the pitcher and put a new filter cartridge in? A. The pitcher should be cleaned well on the inside and outside, because it is used all year round at meals where chametz is served, and it would be commendable to use a new filter cartridge for Pesach. [Placing your “chametz” cartridge in water for Pesach will allow you to reuse it after Pesach.] There is no need for a hot kashering of the pitcher.