Arm & Hammer Odor Eliminating Vacuum Filter, Hoover T HEPA: * Designed according to strict HEPA standards * Baking soda particles neutralize odor-bearing chemicals * Releases clean, odor-free air into your home as you vacuum * Replace filter every 90-120 days for optimal performance * Filter is washable * For use in Hoover T-Series WindTunnel, Windtunnel Pet, Windtunnel Rewind, WindTunnel Rewind Plus, WindTunnel Pet Rewind and WindTunnel Purely Clean (UH70100, UH70105, UH70107, UH70110, UH70120, UH70130, UH70200, UH70205, UH70210, UH70211, UH70212, UH70215) Bagless Uprights