Countertop water filters reduce a variety of contaminants. Choose from single housing, double housing, or reverse osmosis countertop units. Please contact our Customer Service department if you need help determining the best countertop filter system for your needs. We also carry an extensive inventory of replacement countertop filters for your existing countertop filter system. Go to our Replacement Countertop Filter Cartridge Page to see all of our replacement countertop filters.