I have never used chemicals. Don't dump after each trip unless full and never had a smell problem yet. As I understand it, the most important thing to keep smell is a good flow of fresh air. Make sure the vents are clear and make sure there is at least 2 times as much water as waste in the tank.
Just my 2 cents.
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Dan and Kathryn DeBruin plus dogs
2005 Newmar Dutchstar 4009
Victor NY
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