Folks these are all great ideas. I run a 10" clear section on the end to observe the waste tank efficiency. The tank has been in use now for two years and this is the first issue. I tried a snake from the top side, but could never actually hit the drain end. I was very, very brave and did run a snake from the OPEN end. I was so crazy that I had my wife manning the valve when ever something started moving towards me. I think I will try the back flush from the gray water: I should have known about this from my Army maintenance studies. I'll give it a try and let you know. As always, thanks for all the great ideas.
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