The whole home H2O filter is the most useful and beneficial home appliance you can have. Many of the industry's water filter systems are made by a handful of manufacturers. Different companies buy these water filters and put their own"marques" on the filters even though the water filtration technology may be one and the same. If you require a more steadfast supply of filtered water, and if you'd like to use filtered water for ice cubes and coffee, a faucet-mounted water filter is the way to go. At the very least, water filters improve the taste of tap water by getting rid of impurities. How to find the right water filter for your home. Household water filters generally fall into one of two categories: point-of-entry units, which treat water before it gets dispersed throughout the house; and point-of-use units, which include countertop filters. A simple faucet mounted unit will do untill you decide which unit will best suit your needs.