I use the geo method as well. What I also do: when getting ready to leave the CG and it's time to dump (regardless of levels in tanks,) I'll fill the tanks with water--open a water tap for gray and use a stick to open the pedal valve on the toilet. Fill, then dump. Then, I fill again with clean water, dump both again. Then put a little water and chemicals (and ice if desired) for the ride home, and you're ready for the next trip. It takes a little longer (all the filling and dumping,) but my tanks are clean and I've never had any odor doing it this way.
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2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)27 ('17) 20 (‘18)21 (‘19)23
2019 Honda CRV (camping support vehicle)
2014 Harley Davidson FLHX (XLR cargo)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)
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