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.