To continuously enjoy, cleaner, better tasting drinking water, remember to change your PUR Water Pitcher & Dispenser Replacement Filter (PPF900Z) every 2 months or after 40 gallons of use. A PUR pitcher water filter replacement cartridge reduces 2x more chemical & physical substances compared to Brita's leading pitcher filter* through its powerful 2-in-1 genuine PUR filtration technology that filters water fast. † These replacement water filters have also been rigorously tested and certified by NSF to reduce chlorine, mercury, copper, zinc and other chemical & physical substances that can cause bad taste and odor in your drinking water. Be cautious of 'off-brand' water filters. They are not tested nor certified to filter the same as Genuine PUR Water Pitcher & Dispenser Replacement Filters in PUR and Beautiful by PUR systems. Genuine PUR water filter replacements are the only water filters certified to reduce chemical & physical substances when used with your PUR or Beautiful by PUR water pitcher or dispenser system. At PUR, we believe that everyone deserves cleaner, better-tasting drinking water. That's why we've been developing innovative, superior water filter system technologies for over 35 years. Disclaimers: *Versus best-selling Brita pitcher filter OB03. Brita is a trademark of Brita LP. †Compared with PUR PLUS Pitcher Filter. **Based on comparing a year's worth of bottled water (16.9 oz) to a PUR System and 5 filters. Based on Nielsen US sales.