Vitamax Deluxe Activated Carbon Fiber Shower Filter Cartridge 2pcs Replacement Water Filter Includes TWO (2) ACF Replacement Filter(202ACF) ACF Refill Filter(202ACF) of Deluxe AF Shower Filter(UDAF-202ACF) was developed for the purpose of doubling the performance (Sedimentation + Activated Carbon) and utility of the shower filter for water treatment. Available for 4~6 months (around 11,400 ~ 17,000 gallons / depending on water quality and usage)