Maybe it's time to do some investigating pull the back wall in your basement and check all the wast lines going down to the Black tank or pull down the coroplast and check to see if you have a crack or something wear the pipes go into the Black tank. We use Happy camper in are tanks and never have problem any smells or other problems!
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Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
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