Ice Flakes 1 Pack Refrigerator Water Filter | Compatible with Replacement Pur Water Filter 3 High grade carbon block, that removes over 99 percent of numerous potentially harmful contaminants which may be present in your water. This water filter housing is for refrigerators Easy filter replacement: No tools of water-turnoff required to replace cartridge inside refrigerator High grade carbon block, that removes over 99 percent of numerous potentially harmful contaminants which may be present in your water. Six-month filter life: For best filtration results, filter cartridge should be replaced every six months or 300 gallons