How to Get the Stink Out of Bathroom
We follow all the guidelines; dump when at least half full, dump the black water first and flush for 5 minutes, then the grey water, and then add the chemicals. Still within a short time, we have th...
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Check the air admittance vent valve under the sink. It screws onto a PVC stub and has a rubber check valve in it that can get brittle with age and fail to seal properly. Replacements are only a few dollars at most home improvement/hardware stores. The black and grey tanks usually share a single vent, so the smell could be coming from either one. Yes, grey tanks can smell as bad, if not worse, than the black tank.
