blank tank deodorizer: when to add?

I'm with Bob. You don't need to spend your hard earned $$ on these so-call "needed" chemicals. They are NOT needed. Simply use lots of water when draining, and add several gallons after cleaning.

As others have mentioned, when getting ready to travel, put a couple of gallons in the tank and add some laundry detergent (I use liquid Oxy Clean). The rocking motion of the trailer while traveling will slosh around the soapy water and clean the inside of the tank.

You don't need the blue stuff at all.

Ron

In my 40+ years of RVing I have never had or smelled the need to use anything but water. If you are gettin an odor there is a venting or seal issue. Install a good flushing kit. Flush and save your money and the envirnment

GaryWT wrote:
I always add right after I dump so it is in there doing what it does right away and you are not playing catch up.

X2

I always add right after I dump so it is in there doing what it does right away and you are not playing catch up.

rr2254545 wrote:
I would do it now with water - that way it is ready to use and does not get dried up

That's what I do.

I would do it now with water - that way it is ready to use and does not get dried up

Always leave a few gallons of water in the black tank, and water to cover the toilet seal. You shouldn't get odor in the RV unless the tank vent is blocked or you run the vent fan while flushing.

Wait until the next trip.

But as an added note, always leave an inch or two of water in the bowl at all times.

I would first wait and see if you even need it. We haven't needed it in our current rig at all - but needed to use it all the time in our old camper.