Arm & Hammer filters work while you vacuum, removing household odors along with dirt, dust and pet dander to help improve indoor air quality. As dirty air passes through the filter, baking soda particles neutralize odor-bearing chemicals. Maintain optimal vacuum performance by replacing your filter every 90-120 days.Arm & Hammer Odor Eliminating Vacuum Filter, Eureka PMF-1:Baking soda particles neutralize odor-bearing chemicalsReleases clean, odor-free air into your home as you vacuumReplace filter every 90-120 days for optimal performanceFor use in Eureka Capture and Capture Plus (8800, 8850 Series) Uprights