Regardless of what type of water system you select, check to see if the system is third party certified before making your final decision. NSF International, an independent testing organization, is internationally recognized for its experience in testing and certifying products to ensure they perform as claimed. The Water Quality Association, the regulatory body of the water quality industry, also validates products.
Just because a manufacturer displays the WQA logo, signifying that the company is a member of the Water Quality Association, doesn’t mean its products are validated. And just because a product is NSF certified for some contaminants doesn’t mean it protects you against all of them. If you are concerned about very specific contaminants, you must check to determine that the system you choose is specifically certified to reduce them.