Blue Streak Unbelievable.
Check this out. It needs an easy installation but is worth it. I think that it's the best upgrade I did to our camper. Never a bad odor, constantly cleans the gaskets and valves, provides a nice powder scent, and leaves blue water in the bowl. When you flush, it adds just the right amount of chemical every time.
https://www.bluestreakchem.com/
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