APEC FILTER-MAX90 US Made 90 GPD Complete Replacement Filter Set For ULTIMATE Series Reverse Osmosis Water Filter System (For Standard 1/4" Output System) APEC ultimate high capacity 5-stage complete filter set is USA made and designed to last 2X longer Includes (1) sediment (2) carbon block filters, (1) Dow Filmtec membrane and (1) inline carbon filter Filmtec 90 GPD membrane is individually lab tested to guarantee the highest rejection rate Certified to remove up to 99% of all contaminants for the best Drinking water quality possible Compatible with APEC RO-90, RO-PERM and most industry standard reverse osmosis system with 10 inch x 2.5 inch filter housings