Leaving holding tank open
Based on your question, I am assuming you are leaving your tanks open. I don’t recommend that. Let your tanks fill at least 3/4 before flushing. Based on when I first started camping years ago (learn as you go method) the solids have a tendency to accumulate in a pile and will require intensive clean out when leaving the tanks open on full hookup.
If that is a false assumption, I will still recommend using treatment while hooked up.
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