Here’s what Amazon Reviewers have to say:
Shouldn’t be; however, just pour a tablespoon to be on the safe side. I used to go weeks between and never had a problem.
By Dr. No can do on August 30, 2016
I empty my blackwater every three of four weeks, no issues.
By v8gee on August 30, 2016
Happy Camper is the best product I’ve ever used. There are, however, limits to everything. It depends on how long since you last dumped. I have held for as long as six weeks without odor.
By Sam S. on August 30, 2016
I’ve waited longer than that between trips and haven’t noticed any odors.
By Bill H. Lubben on August 30, 2016