Any device that pulls air through it requires cleaning and/or preventative maintenance. Consider heating and air conditioning systems, automobile air filters, room air cleaners, etc. RAINBOWAIR ozone generators also require occasional maintenance to keep them operating at peak performance. For this reason we offer a RAKIT54-II. This pack contains 4 new generator plates 4"x6", new filter elements, alcohol preps, fuses and a special purpose brush used to restore dirty generator plates.