YEP, I look at it as a feature.
It help to add fluids and soap to the black tank so the solids can dilute
and saves room in the grey, which is my limitation
ANd this is common as I understand it... not just Thor. Many have it this way.
I recently had a smell issue in the bath. I found that the air admittance valve under the sink was loose. I haven't been back in it yet to see if tightening it fixed my problem.
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