Mock Plumbing also specializes in water filtration solutions and can help provide either a whole house or point-of-use filters. A fully automated, back washable system filtering water at the main water source before entering a home is known as the whole house filter.
Point-of-use filter is for filtering a single source. Nowadays there are many different technologies and companies offering many varieties of filtration systems.
Mock Plumbing suggests that you find a reliable company that will research your specific need, rather than selling you a system that may be overkill or does not correct your problem. Shown in this picture is a reverse osmosis filtration system that is commonly installed under a kitchen sink.