I fought this problem with my 3160 for two years. I cannot explain it but when I replaced the toilet with a Dometic 320 a year ago no more smell and I do not use any chemical treatment except couple of tablespoons of Ridx.
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Butch and Kathy
2016 3160RL Legacy, Sailun S637, Centramatic Balancers, 2-T105s, Amish Refrigeration, ARPrv, SoftStartRV, FlexArmor roof
2016 F350 6.7L SRW
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