Johnny On The Spot dissolves tough uric acid salt build-up, mineral scale, and rust deposits from drain lines. Monthly application of Johnny On The Spot will effectively keep urinals free flowing and reduce the need for excessive odor control products. Hard water areas and high traffic facilities may require additional applications. Johnny On The Spot contains RD-188 which forms a protective coating on pipes and equipment while acidic action takes place. OPENS CLOGGED URINAL TRAPS & DISSOLVES URINE SALT AND SCALE BUILD UP!