Some where there is a link to vedios testing sewer connection mounted back flush systems. The result was very poor performance if there is a straight path to the tank from the flusher and almost totally useless if you have even 1 45 degree elbow between the flusher and the tank. If I had no factory black tank flush, I would drop the tank and install one at the end opposite the drain pipe. If there is no room there,mount it on the side as far from the drain pipe as possible. I'm told that the wands that go down the toilet and spin work good but a pain to use. Please let us know what you do. Jay
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