Geltabs are a unique approach to A/C drain pan treatment. As the moisture either drips on or flows over the geltab, it forms a gel, locking the geltab into place. This locking action never allows the geltab to move or block the drain line. PAN-GEL geltab's uniquely designed formula with AT-8 turns the geltab into a very slow gel release, giving it a positive, long-lasting and aggressive cleaning action. The geltab will clean sludge and other accumulations in condensate drain pans and lines, eliminating plugged condensate drain lines and stale water odors.