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One thing that seems to make a difference is how fast your tank drains. If it drains too slow some solids may settle before being washed out with the flow. The sewer hose support systems seem to help maintain a higher flow until the tank is empty, other wise you'll end up lifting the hose several times to get it to drain completely. Many black water tanks also have a flush water fitting on the opposite side of the drains, use it in addition to the gray water flush. It doesn't hurt to use extra tank treatment, this helps break down any solids. I love having a bathroom in my RV but use a public toilet for solids when available.
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