Forgot to mention...
I read somewhere about using Cascade dishwasher "pods" in the black tank to help keep it clean. I always put 3-5 gallons of clear water into the black tank (running the bathroom sink) after I dump, whether flushing it or not. Then I toss a pod or two down the black hole.
I don't know if it really helps, but so far no issues. I get them in bulk at Costco.
Regards,
Randy
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