Product Description Product Description Replacement cartridge; For use with Culligan models SY-2300, SY-2000, SY-2500, SY-5197 and SY-2650; Reduces bad taste and odor, chlorine taste and odor, sediment, lead, asbestos and cysts. From the Manufacturer The Culligan D250A premium replacement drinking water filter cartridge set reduces bad tastes and odors and sediment and various other contaminants, utilizing a granular carbon pre-filter (gray casting cartridge), along with a .5 sub micron carbon block cartridge. This cartridge set is rated to last 500 gallons, about 6 months . From the Manufacturer The Culligan D250A premium replacement drinking water filter cartridge set reduces bad tastes and odors and sediment and various other contaminants, utilizing a granular carbon pre-filter (gray casting cartridge), along with a .5 sub micron carbon block cartridge. This cartridge set is rated to last 500 gallons, about 6 months .