Black & Grey tank chemicals - What do you use ?

I don't smell anything coming out of the vent. I guess it dissipates before it reaches ground level.
In any case perfumed poo smells just as bad to me as natural organic poo.

I never did either until I headed South!

The whole black tank issue simply was not one when I RV'd in Wisconson. Spent years traveling around in the Midwest as a weekend RV'er. Didn't even give thought to the black tank except to dump daily or at the end of the weekend.

THEN.....one month in Florida in the Summer with no hook-ups trying to stretch my having to break camp to move MH to dump off site.......made ME a believer of good chems in the black tank to control odor!

Also, dumping at dump stations or CG hookups without sealed caps on opening and sewer hose can be a gagger. With chems in the black tank it is not.

Trust me fill a holding tank in a MH in 98 degree humid weather and letting it sit any length of time and you WILL start to smell it coming from somewhere and definitely when dumping! :W

BTW: There IS a difference between chems that actually 'control/eliminate' odors and ones that just add 'perfume' which I agree IMHO is even worse.