A “9 gallon black tank?” It depends on how you use your water, but nine gallons is pretty small. I would plan on emptying it daily…if you are very careful with your water use, maybe every other day at best.
I don't know of any 9 gallon black tanks on RVs. My trailer has one on the smaller side and it is a 30 gallon tank. Wife and I full time and need to dump it about every 6 days on average.
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