The HYLA NST Universal Cleaning System is a complete room and air cleaning system. It has a full range of attachments to purify the air and thoroughly deep clean every aspect of your home or place of work, to help relieve asthma and allergies. The HYLA uses water as a filter, so the air flow through the HYLA is maintained at all times, not reducing with use. Because of this, the HYLA is adequately powered by an 850W motor, instead of using a higher powered (and more expensive to run) motor to compensate for loss of air flow as filters clog up. Hyla - the efficient greener cleaning solution.