I had the same problem. And our washer dumps into the 1/2 bath and I thought that would help, it didn't. On my Hurricane 34F the tank is long but somewhat shallow adding to the problem. I installed a Camco 40123 Quickie Flush with Back Flow Preventer and use it to flush the tank when the tank is emptied. I haven't had any problems since I installed the flush.
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2013 Hurricane, Toad 2014 Jeep
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