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The forum has had a continuing and lengthy discussion on flushing the black tank. I am sure if you do a forum search (type in "flushing black tank" or "flushing" or something similar) you will find plenty of information about this same topic which already has been posted. If, after searching for and reading through existing threads and posts, you still need some input, just ask.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax 
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