1. I found your video on emptying & cleaning black tanks to be very informative. However, my one question remains unanswered: Why will my flush valve no longer pass water? Do you think it is clogged with debris or is there an adjustment I can make that will open it back up? If the flush valve is clogged, will the water softener treatment you mentioned solved this problem? We have been full-timing for a year now and I have always flushed the black tank with every dump but now hooking up a hose to the flush valve accomplishes nothing because the valve is apparently closed.

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