Under Sink Water Filters are typically for those that don’t want a countertop filter cluttering up their counter and want the filter out of sight. All you have is another faucet for your filtered water visible.
If you are looking for a undersink to hook to your bathroom or kitchen that does not need a separate faucet, the Aquacera EF300 for the bathroom and the EF500 for the kitchen is just what you need. They connect to your cold water line and then to your main existing faucet. No need to drill holes in your countertop and they hookup without permanent alterations to your plumbing. You can find them below