Poop stinks..ain't no doubt about it
Poop stinking INSIDE an RV is because SOMETHING is broken....vapor barriers
Chemicals just make poop smell like a chemical
My poop stinks...but I do NOT have poop smells inside my RVs because the vapor barriers work (or I fix if broken)
I don't KEEP my poop long. I dump my tanks when full which is close to every 7 days on avg.
So I just use water
Now as to Happy Camper and that MSDS showing it's 100% Zinc
Zinc Chloride has been used for years as a 'mist' over waste treatment sludge ponds for odor control.
Zinc also is used in many underarm deodorant and as a 'supplement' for BO
So guess it should work in waste tank.
I don't know...I don't smell mine and am not going to start sniffing them