1M-4PK 1-Micron Sediment Water Filter Cartridge, 4-Pack 4-Pack of Standard 10" 1 Micron Sediment Filters This is a filter for a standard Reverse Osmosis Water Filtration Unit or any type of Water Filtration Unit with 10" housing Lifetime: Replace two or three times a year, depending on the water quality This filter is wrapped and sealed and meets NSF Standards and Regulations Dimensions: 10" x 2.5" Industry Standard 10 inch 1 Micron Sediment Filter - Used for effectively removing most sediments, bacteria, cysts, chlorine, fluorides