Freshen sink and drain lines to eliminate odors. Quick-dissolve tabs use the same odor-control formula found in Porta-Pak Holding Tank Deodorizer plus enzymes that dissolve grease in the grey water tank, garbage disposals, and drain lines. The triple action deodorizes grey tank, freshens sink and drain lines, and dissolves grease and organic sludge. Continued use keeps tanks and lines free-flowing and odor-free.