GE Profile FQROPF Reverse Osmosis Replacement Filter Set Reverse osmosis filtration: Water is filtered three times Includes two filters: Filters fit PXRQ15F, PNRQ15F, PNRQ20F, PNRQ20R and PNRQ21R reverse osmosis filtration systems Premium filtration: Certified to reduce lead, arsenic, select chemicals, and 12 other contaminants Twist and lock design: Simple design provides easy, tool-free, no-mess filter replacement Six-month filter life: Filter should be replaced every six months for best filtration results