All ActivityMost RecentMost LikesSolutionsRe: Toilet Smells Horrific When FlushingThanks for all the great replies, I appreciate your taking time to help me out. Here are my responses: No bleach or other chemicals for me. The septic system we installed for our building was extremely expensive and I am not going to mess with that biology. Moving the trailer out of the building is not an option right now. Vent is definitely not blocked. I have thin vinyl dryer type hose connected to all three tank vents and they are tee'd together to one vent line exiting the building. There are definitely lots of bends and it does not go straight up. This morning I installed an inline vent van in the common line from all three vents. Let's see if that helps. Cheers!!!Toilet Smells Horrific When FlushingI posted a while back about a venting problem we had with our 5th wheel that is. Sing lived in while parked indoors. (https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30096797/gotomsg/30097053.cfm#30097053) I capped all three tank vents, black and two grays, with dryer vent hose and ran them outside the building. This solved our smell inside the building but outside the trailer problem. However, lately we are experiencing a bad - and I mean REAL bad stink every time we flush on the inside of the trailer. I have been draining and flushing the black water tank twice a week but this doesn’t seem to help. I am hesitant to use strong chemical deodorizers because the trailer is dumping through a future toilet flange to our septic tank and drain field. What do I do? The wife is ready to move out, it’s that bad.Re: Venting IndoorsThanks so much for all the great answers and, of course, a few silly ones. I have been keeping the two grey water tank drains open, and want to continue doing so, which is the source of the back air flow when the wind blows. I do keep the black water tank valve shut and we celebrate Sundays by draining and flushing that tank. It's like a party!!! Yippee!!! But at least there is no poo pyramid as so eloquently stated above. I had ordered all of the parts to do a makeshift connection to all three vents and vent the assembly through the building roof. I have to admit I was not excited about the prospect of punching a hole through my new steel roofing without knowing exactly where the plumber would do so later on in the project. The big prize of the day goes to Lantley for the suggestion of the Air Admittance Valve. This is the best idea ever. I did not know such a thing existed. I just ordered three of them and I'll report back on how they work once they are installed. Cheers everyone.Venting IndoorsHey folks. First post here and it's not a pleasant one. The wife and I are building a 10,000 sqft steel building that will house a production winery, a tasting room, and a small 3 bedroom residence. We have the building weathered in so we moved our 34 ft Alpenlite 5th wheel in to the space where the residence will be built while we finish the business portion of the structure. I hooked the RV's sewer hose up to one of the toilet drains in the building and we are dumping black and gray water in to our building's septic system that way. All is well except we are struggling with the trailer's black water tank vent stinking up the buildings air space. Especially when the wind is blowing outside. I would love to hear some ideas on how to stop this as, in my wife's word, we are tired of living in what smells like a porta-potty. Any great ideas?