2 pack Level 1 Drinking Water Replacement Cartridge - Culligans Level 1 Basic Replacement Drinking Water Filter Cartridge reduces Chlorine taste and odor, bad taste and odor and sediment. With its durable, non-cellulose carbon construction and a 5 Micron rating, this filter is ideal for under sink applications; recommended for use with city and well water supplies. It is NSF Certified and will last through approx. 250 Gallons or approx. 3 months depending on water being filtered. For use with Culligan models: US-550, US-600, RO-3000 and RO-3500. 2 per package. Filters Only.