How do I control odor from the holding tank?

Dometic recommends the use of a marine holding tank treatment (like the Dometic MAX Control line) to eliminate odors and help break down solids. An added level of control would be to add a Dometic vent filter to the vent line, although we still recommend the use of a holding tank treatment with this. Check your local and regional laws for chemicals that cannot be used in your area as this changes from time to time.