(4) gallon containers. NSF Certified nonacid alkaline drain opener to dissolve and remove obstructions in clogged or slow-running drains. Removes grease, hair, food, paper, and other organic materials. Highly concentrated solution goes right through the water and directly to the source of the clogged or slow-running drain. Nonfuming, no acid or bleach odors, safer to use on plumbing. Regular use prevents plumbing problems and water damage caused by backed-up drains. Liquid formulation is easier to use, works faster, and goes directly to the source of the problem – even in cold or stagnant water. Use in drains, grease traps, and sump pits.