Also, and something often forgotten/delayed, did you add chemicals back to the tanks with a little water after you emptied them? I always add a little chemical to the gray tank also. Make sure you run a little water in your sinks as well. Often, the vacuum from emptying tanks will pull the water from your P Traps, leaving them empty allowing fumes back up the pipes. There's also some type of anti-back flow vent under the sinks that you can adjust. Not sure of them but the factory service adjusted/replaced mine and have no more smelly issues since.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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