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Not a dumb question.
Yes there is a black tank flush. My previous 5er was a 1994 Avion which also had one.
We are a 60+ yr old couple so 2 adults.
I have found even tho the flush water is running out clear, if i dump water thru toilet into tank there will be debris continue to flow out.
With my DW inside filling and dumping toilet into black tank i monitor with on / off of flush and dump valve.
I am not sure spray pattern of flush feature but suspect perhaps dumping ever 2 to 3 days may provide more efficient cleansing of tank. Waiting til nearly full may allow excessive debris to cling to sides of tank. Thanks so much for your input
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