Aqua-Kem Holding Tank Deodorant is an effective odor control for your Airstream’s sewer system. It works so well cleaning and eliminating odors that it's secured a spot as the #1 selling holding tank deodorant. With superior waste digestion, it cleans tank walls and drain lines keeping your system clog-free. When disposed of properly, this liquid is 100% biodegradable and environmentally safe.