Black drain issue

[Kirk W]

I think that the problem with dissolving or breaking up a plugged up waste tank is getting something to pernitrate it. Unfortunately, most of those who post on the RV forums with that problem never come back to share what solved the problem.  In my years of RVing I have only personally known two people who had the problem, the one who used Robeic at least 3 or 4 times over about a 2 week period and the other used a plumbing snake from the discharge end of the system. The second person has quite a story to tell and one that makes me happy that I was not there.