Keeping your air cleaner, longer was also a focus in the development of the MAC Air System. It utilizes a dual filtering system that increases overall performance and helps prevent premature clogging of the filter. The external pre-filter utilizes uniform micro-perforations that filter out most dust and debris before it reaches the primary dry media filter. Both filters are easily cleaned utilizing a mild detergent like dish soap and simply agitating the filters in the water and rinsing.