Designed to penetrate, dissolve and remove odor-causing residue that can occur in all washing machinesSpecially formulated tablet dissolves slowly, lasting throughout the entire wash cycle and breaking up residue better than bleachSafe to use with front load washing machines and top load washing machines - high efficiency (he) and conventional washersUse once a month to keep your machine fresher and cleaner, septic tank safeSeptic-SafeDesigned to penetrate, dissolve and remove odor-causing residue that can occur in all washing machinesSpecially formulated tablet dissolves slowly, lasting throughout the entire wash cycle and breaking up residue better than bleachSafe to use with Front Load Washing Machines and Top Load Washing Machines - High Efficiency (HE) and Conventional WashersUse once a month to keep your machine fresher and cleaner, Septic tank safe.Note: The date on the item is production date not expiry date.