Our choice was the Aquasana brand of water filters. These filters are widely sold and have achieved both Underwriters Laboratories approval and been rated a “Best Buy” by Consumers Digest magazine many years in a row. They have a easy to maintain and replace twin-cartridge system that removes over 99 percent plus of contaminants, and remove over 130 know contaminants which are not required to be checked by your local municipal supply company.  Their filters are also guarantee to please for 60 days or your money back.