While the ultraviolet disinfection technology may not be a necessity, keeping a humidifier clean is vital. In other models, that requires scrubbing any part that contacts water to keep bacteria from forming and being distributed into the air. By treating the reserve water, the Dyson will move only clean fluid.  Top Home Tech News from 2014, and What to Look Forward to in 2015 by Kelsey Keith from Dyson Humidifier Will Keep Your Air Clean Using Bacteria-Killing Technology