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We used to dump the black tank and close the valve and refill to the top of the tank with water and flush again ... Last time I did this with ours I went to fill the black tank with water and the water never came to the toilet.. Im filling the tank via the toilet flush... The Black tank On our 17 Montana is the 543 tank and it is two piece.. The top of the tank busted off and the sewage went everywhere...So. I suggest using the hose wash like Carl said..The water pressure from filling the tank broke the glued portion of the tank.. Notice the tape.. I guess the tape is supposed to keep the tank halves together...
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