Check the listing for details. Nazava PROT3CT Filter Cartridge: Alternative to Berkey Water Filter Cartridge. Condition: New. Listed at 24.99 USD. This powerful filter element uses ceramic pores, activated carbon, and silver ions to provide you with high quality drinking water, and all around protection for you and your loved ones. It's unique, versatile design, means that it fits other counter top water filtration devices like those from Berkey, ProOne, and more! The unique end-of-life indicator provides an extra level of quality assurance so that you know when it's time to replace your filter. Rest assured that you will have clean and safe water wherever you go when you use a Nazava cartridge! SIMPLE BUT POWERFUL: Using activated carbon and silver ions to provide fast countertop water filtration, this filtered water dispenser protects you from 99.9% of bacteria and protozoa.EASY INSTALLATION: Replacement water filters shouldn't be hard to use. Check the unique end-of-life indicator to know when to change your filter, and the step-by-step instructions to know how. VERSITILE FIT: Enjoy seamless integration into other gravity water filter systems. Use this activated carbon water filter to upgrade your British Berkefeld, ProOne, Walter Filter, or Berkey water filtration system, LONG-LASTING QUALITY; wait longer in between your replacement water filter cartridge. After two years of use, 99% of Nazava ceramic water filters are still functional!HIGH QUALITY LOW COST: Enjoy clean and safe water, free from contaminants and still save money by using in place of an expensive replacement water filter cartridge from brands like Berkey.