Filter Replacement Set for EWS Three-Stage FUGAC300 Item No. Included in This Set: PRESED-05, PRESED-20, GAC-00 Description: 5 micron pre-sediment filter, 20 micron pre-sediment filter, Granular activated carbon postfilter Replacement Schedule: up to 1 year, not to exceed 1 year Filter Codes: 1, 2 & 6