Roebic K-67BAG-4-16OZ 16-Ounce Granular Drain And Trap Cleaner
For just pennies a month, a concentrated granular easy to use 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.