My guess is that the cost of the raw chemicals is a small part of the $400,000. If there's 500 toilets on board that's $800 per toilet. What is probably much mo

My guess is that the cost of the raw chemicals is a small part of the $400,000. If there's 500 toilets on board that's $800 per toilet. What is probably much more expensive is safely transporting the chemicals in massive amounts, storing them, inspecting all the pipes after the treatment, and safely disposing of the chemicals. The GAO report doesn't say what they're using. I wouldn't even be that surprised if the acid flush was actually done with a base like Drano/lye