Roebic Laboratories K-67 Granular Concentrate Drain and Trap Cleaner, 16-Ounce

From the Manufacturer For just pennies a month, K-67 eliminates slow and sluggish drains in your home by removing layers of build-up in the trap and along the entire length of pipe. K-67 works through bacterial and enzymatic action. It is non-corrosive and will not damage pipes or burn skin.