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A couple of other things that you could try to unplug the nozzles, try putting a few (4 or 5 ) gallons of vinegar down the tank and leaving it for a few days, a camping world tech told me to try this. Another possibility is blow compressed air through the black water flush using a blow out plug used to blow out the water lines, don't exceed 60 psi. I did both and my black water flush is working again. I saw a video, which I could remember where which showed that the best way to flush a black tank was using the black water flusher, it compared hydro flush and other back flushing methods and showed that only a black water flusher actually does the job.
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