Marine Digest-It Holding Tank Treatment is a natural product that packs a powerful punch. Using billions of microbes, Marine Digest-It will turn everything in your holding tanks into liquid, including household toilet paper! This inexpensive and effective natural cleaning product completely eliminates odors and clogs in your boat's holding tank and is completely safe for the environment and waterways. If you're earth conscious, you'll never have to sweat about putting harsh chemicals in your tank again - every ingredient in Marine Digest-It is safe for humans, animals, and the environment. It is also a great solution for ridding your bilge area of odors. If you don't love it, we'll give you a full refund!