The PUR Maxion Filter Technology reduces copper, mercury, certain pesticides and industrial pollutants. It also reduces chlorine (taste and odor), and more. It is certified to reduce 12 contaminants, 2x more than Brita. This filter works twice as fast, and the LockFit filter design allows for easier filter changes. 1) One filter provides up to 40 gallons/640 8-oz cups (2 months) of clean water, 2) Leaves behind beneficial flouride, 3) Unique, secure-fit filter guarantees unfiltered water won't mix with your clean filtered water, 4) NSF certified, 5) Fits all PUR Pitchers and Dispensers.