Affresh Washer Cleaner pucks effectively remove and prevent odor-causing residue in all brands of high-efficiency washers. Designed as a formulated, slow-dissolve foaming tablet, it gets under residue, breaks it up, and washes it away, leaving your washer smelling fresh and clean. Simply place one tablet in the wash basket (without clothes) and run a Normal Cycle (hot option) or Clean Washer Cycle. Affresh brand is environmentally friendly, safe on septic tanks, and won't harm any washer components. This pack includes three tablets.