One major advantage of using a under counter water filter is the fact that you do not need to earmark a space either on the kitchen counter or on the wall. They can be conveniently installed under the sink and can be connected directly to the plumbing below your counter. They are directly visible and do not have to be switched on and off like the regular filters, and you are assured of pure and clean drinking water at any time. They are the best value for your money, undoubtedly!
But of course, the under counter water filters warrant more labor where installation is concerned as compared to the ones that are connected to the water faucet. In the beginning, it would be advisable to have the installation work attended to by a professional plumber, to avoid any lapses. Once you are assured of pure and clean water in this manner, you may do away with the idea of purchasing plastic water bottles, because in the long run, having water filters at home turn out to be far more economical.