We pioneered DARC cleaning. This is simply the best way to help ensure that the most critical component of the ionizer – the electrodes – stays free of scale buildup. Scale is the enemy of performance. The Vesta H2continues our tradition of offering the best cleaning system so you get great performance, especially over time. It also gives you the peace of mind of never having to think about cleaning or waiting for a cleaning cycle to complete. The Vesta H2 for the best performance and ultimate convenience!