6423 - Hydration by Haws Replacement FilterHaws 6423 Hydration by Haws Replacement Filter Model 6423 replacement filter is used with the Hydration By Haws bottle filling stations. It is a carbon block filter cartridge with a service life of 1 year 2,500 gallons (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. Tested and certified by