The Pure Filter Granules make your water softer, cleaner and tastier by reducing limescale, chlorine and heavy metals. Made exclusively for the Aarke Purifier technology, the granules in the bag are poured into the Purifier’s refillable water filter cartridge. Created in collaboration with BWT, one of the world’s leading water technology companies. Each bag filters up to 31,7 gallons of water and lasts up to 8 weeks.