I have 2 Ionic Pro Platinum Air Purifier. Powerful and durable yet quiet and convenient, this air purifier doesn't require any replacement filters and never loses its effectiveness. It covers up to 600 square feet in your home, and it's easy to move it around from room to room. The purifier is also an eco-friendly solution that can save you money: it's Energy Star certified and uses only one-third of the energy of regular tower air purifiers. One was used for one month, asking $100 The other is brand new in sealed box. Asking $125