 You don't have a filter subscription. It uses electrostatic plates, so you don't have to ever have a filter subscription. And then it wipes out odors, smoke odors, litter box odors, pet odors, fry odors, cooking odors, musty odors, you name it. I've used it in a rental car because someone hotboxed in the car, and it stuck to high heaven, and the Eden Pure Thunderstorm wiped out the odors. It just works. EdenPureDeals.com. The discount code, ERIC3, E-R-I-C-K-3.