The Defender filter virtually eliminates the tremendous amount of the backwash water associated with sand filter operation. Instead of reverse flushing, as with a sand filter, Defender simply discharges the spent media directly to waste and is recharged from time to time. The Defender filter will remove particles down to 1 micron. The Defender filter is especially effective on pools with heavy bather loads because of the increased filter area and dirt holding capacity. Advantages include saving millions of gallons of water and waste; delivering superior pool water quality; saving on costly mechanical room space; and saving chemicals, fuel costs and energy.