Carbon Filter used with Purefresh toilet seat</br>Carbon Filter neutralizes incoming odors</br>Carbon Filter provides a continuous deodorization of the toilet when activated</br></br>Product Description</br></br>Designed for use with the Purefresh toilet seat?? this replacement carbon filter provides continuous deodorization for a fresher bathroom environment.</br><br/>http://www.amazon.com/gp/product/B00OVA7RLK