Venting advice needed

[Brewster]

Hi everyone, I would appreciate any help you can offer my way. The first photo shows how this bath was
originally plumbed. We have a sewage treatment plant and I could hear bubbling coming up through the
shower drain as well as some gassy smells. The second photo shows the modification next to the vanity drain.
I basically closed off the connection between the two horizontal 2" pipes. No more smells or bubbling sound,
but occasional gurgling sound coming from the vanity sink opening as well as the shower drain. The third photo shows the p-trap and venting of the shower drain. Would an AAV under the vanity sink help with this,
or what would be the way to go. Again, thanks for any help.

 

[Reach4]

We have a sewage treatment plant and I could hear bubbling coming up through the
shower drain as well as some gassy smells.

Before addressing your plumbing, how long since your septic system was pumped?

Your bubbling etc may have been a useful early warning that could get you to save thousands of dollars.

 

[Sponsor]

 

[Brewster]

Before addressing your plumbing, how long since your septic system was pumped?

Your bubbling etc may have been a useful early warning that could get you to save thousands of dollars.

It was pumped out 2 months ago, so I don't think that's the issue. Water drains out of the toilet, sink and shower very quickly, only problem
seems to be the gurgling sound.

 

[Reach4]

It was pumped out 2 months ago, so I don't think that's the issue.

Good.

I could hear bubbling coming up through the
shower drain as well as some gassy smells.

The vent for a shower needs to be on the output of the trap -- not the same side as the shower drain. The trap should probably feed over to the wall to the vent, and then the drainage would proceed elsewhere. I think most people use the vented lavatory (bathroom sink) drain to wet vent the shower.

I am not saying everything else in the pictures is OK. I just did not notice anything clearly wrong.

 

[Jeff H Young]

Basicaly everything is plumbed wrong but the worst is the shower underground work. If you look at something showes how a shower is plumbed copy that.. And while the walls are open make sure the vent for toilet is 6 inches above counter top height of lav. Then where the 2 inch vent ties into stack put the santee on correctly and youll be good to go. Sorry to bring bad news but thats how it is.