Aquaboon 1 Micron Sediment Filtration 2 Pack Replacement Cartridges 2-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