Black tank- dump it or leave it?
Our TT usually stays on a permanent site, which we visit every other weekend or every 3rd weekend. When we depart on Sundays, I usually fill the black tank up with water, since it's nowhere near be...
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If your tank is hooked like our Class C was, with the lav sink also emptying into the black, odors can back up if the trap under the sink dries out. Just plug the sink, to be safe.
