This range of duplex water softeners with Clack valve is designed to provide continuous water treatment in residential, professional, and commercial applications, with models available from 16 to 200 liters of resin (approximately 4.2 to 52.8 US gallons). The alternating twin-column system ensures that one tank is always in service while the other remains on standby or in regeneration, providing continuous water supply and more efficient cycle management. The Clack twin control logic automatically switches