Model 6429 Brita Hydration Station replacement filter is used on the Brita Hydration Station and is tested and certified by CSA against NSF/ANSI standard 42 for the reduction of chlorine (taste and odor) and against NSF/ANSI standard 53 for the reduction of lead and 99.99% of cysts. It is a carbon block filter cartridge with a service life of 1 year/2,500 gallon (9463 L). Filter contains an onboard chip to store total gallon usage; this chip interfaces with an electronic Lifecycle Control system to allow water flow only until the filter reaches its total gallon capacity.