Culligan D-15 Level 1 Basic Filtration Drinking Water Replacement Cartridge, 2pk:Fits Culligan's RVF-10Use with Culligan models US-550, US-600, RO-3000 and RO-3500Reduces: sediment, bad taste, aesthetic chlorine taste and odorIdeal for well water applicationsFor point-of-use, under-sink or pre-tank RV installationsNot for point-of-entry whole house applicationsCartridge life is up to 3 months or 250 gallonsCartridge change reminder sticker includedModel# D-15-DWater filter replacement cartridge, 2pk This product ships in approximately 1 days