Cleaning the grey and galley tanks

There should be no odor if the P-traps are
correctly installed

UNLESS

The water in the P- traps have evaporated.

That several oz. of water in the P-trap is
what blocks the gas.

The AAV is very common and can be found at almost any hardware store's plumbing section. I see them at Home Depot and Lowes all the time.

Ron

lanerd wrote:
I know under sink you will find an Air Admittance Valve....Ron

I had temporarily removed that thingy you mentioned when reworking my cabinet drawers. I did not notice it having a check valve inside. It seemed to be a simple vent. Maybe I was mistaken. It makes sense it would be a valve.

I don't think there is a valve in the vent pipe....is there? I know under sink you will find an Air Admittance Valve....but it surely isn't in the vent pipe.

Ron

If your p traps are working correctly there should not be any smell inside the RV. We had a smell coming from the bath sink. Found is was mold and stuff in the drain. Cleaned the drain with simple green and baking soda....no more smell. May just need to clean your drains.

The other option is a valve in your vent pipe...have head of those going bad.

It is critical that our waste tanks smell clean because our motor home is parked in our garage under our master bedroom. We could not tolerate sewer gas.

We control odor two ways.
1) We don't poop in the toilet. We deposit that direct into public facilities.
2) When the travel season is over, I put some bleach down the drains into the tanks and fill to capacity. After they soak an hour, I flush them and all smells fresh like new.

Been practicing this for 7 years and all remains in good order.

Here is our rig stored inside under our bedroom.

A bucket of soapy water using dawn dish detergent, half in grey half in black and no odor. I read once a man was tossing a bag of ice in his black before he headed out and his odor disappeared,

his theory the ice scrubbed the tank as he drove, also claimed his sensor problem went away.

Try The Geo Method in your holding tanks.

Old-Biscuit is correct. You need to figure out why you can smell the odor from your tanks.

I also have never experienced odors from my gray tank, but I've heard of those who have and it's not a good odor. I'm with oldbisket, there shouldn't be an odor unless you have a defective system somewhere. Masking the odor is just a bandaid fix, and you should find out the reason why you have the odor. Check all items hat oldbisket mentioned...especially the under counter air admittance valve..those are usually the culprit.

Good luck

Ron

We use a cup of Borax powder (found in the laundry detergent area) and a cup of Dawn Platinum dish detergent every time we dump the tanks. We add about a gallon of water with the Borax and Dawn. No odors.
We used to use all kinds of tank treatment and none worked.