APEC FILTER-MAXCTOP-PH US MADE 90 GPD Complete Replacement Filter Set for ULTIMATE Series Countertop Alkaline Reverse Osmosis Water Filter System Apec water ultimate series FILTER-MAXCTOP-PH is for ro-ctop-ph Includes (1) sediment, (1) coconut shell Carbon, (1) down filmtec membrane and (1) ph+ calcium carbonate alkaline filter High performance replacement filters compatible with all standard countertop ro systems Removes up to 99% of total dissolved solids (TDS) and contaminants such as arsenic, lead, fluoride, chromium, radium, bacteria, viruses and much more Apec's extruded Carbon filters far surpass any other filters in performance and absorptive capacity; in addition they DO not leak Carbon fines