Made exclusively for the Aarke Purifier technology, these granules are made to be poured into the Aarke purifier’s refillable water filter cartridge. Created in collaboration with BWT, one of the world’s leading water technology companies, this system makes your water softer, cleaner and more enjoyable by reducing limescale, chlorine and heavy metals. Each bag filters up to 31.7 gallons of water and lasts up to 8 weeks