The Walex Porta-Pak RV Holding Tank Deodorizer delivers powerful odor control in any climate. The #1 portion control product around the world, Porta-Pak comes pre-packaged so there are no spills. Just drop it in. The pre-packaged water-soluble packet controls odors, breaks down waste and paper, and lubricates valves and seals.• Unbeatable odor prevention• Pre-packaged portion control• Breaks down waste and paper• Cleans holding tank and sensors• Convenient zipper bag for easy storage• Formaldehyde-free• Biodegradable Breaks down waste & toilet paper Cleans holding tank & sensors & lubricates valves & seals Biodegradable & formaldehyde-free | Walex Porta-Pak RV Holding Tank Deodorizer, Clean Linen, 10-Pack