I suggest getting yourself some Happy Camper Extreme from Amazon and treat your tank with this environmentally friendly great product. After trying many products, this is the only one that has kept us completely odor free for the last year and a half. Be sure that when you drain the black tank you rinse it well, and I mean well, then close the valve and let it fill with water for a couple of minutes (to keep solids from building up). I also use Happy Camper in my gray water tank because odors can come from there also. If this doesn't work, then check your vent on top of the roof. Dirt Daubers, wasps and critters sometimes build nests in the vent so make sure it is clear. I bought, but never installed, one of those vent covers that spin around from Camping World. Didn't need it after Happy Camper was found. Others have told me that vent cover works well and it isn't real expensive so you might try that.
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Mel (Melanie) and Harry
2009 Tiffin Phaeton 40QTH
2014 Jeep Wrangler Sport
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