APEC FILTER-MAXCTOP US MADE 90 GPD Complete Replacement Filter Set for ULTIMATE Series Countertop Reverse Osmosis Water Filter System Apec water ultimate series FILTER-MAXCTOP is for ro-ctop Includes (1) sediment, (2) coconut shell Carbon, and (1) dow filmtec membrane 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 Apec's extruded Carbon filters far surpass any other filters in performance and absorptive capacity; in addition they DO not leak Carbon fines