Another toilet question...no snakes though.

The house we are building in Baja is done.
1 out of the 3 toilets doesn't hold water in the bowl.
You flush it, it has the usual amount in the bowl after the tank refills. Come back in 10 or so minutes and it's down past the outlet.
What gives?

 

Global warming

 

Do you have a thirsty dog?

 

No dogs.

 

Improper venting can create a back siphon.

 

Yep bad vent pipe. Could be clogged or bad design. Clogged is easy snake the vent. The other is harder but you can install a vent in the wall. They make a check valve setup thing so no stank and no need to run it up through the roof. I always forget the name of them though.

 

Oh and no dog! Commie deserves a bad working toilet!

 

The vent thing was my thought also.
Which sucks. Slab floor, cinder block walls. Going to be a tough fix.
What's perplexing is you can see the water level move up and down slightly when the wind is blowing the right direction. So the vent isn't clogged.

 

Air admittance valve (AAV). Buy two so you have a spare. They are a wear item. Maybe every year. Not 100% sure. So put it somewhere you can reach.

 

I think per code they have to be. One company makes a box you put it in that allows are from the room as the in and you can pull the grid for access. Read you should not enclose them in drywall.

 

Buy two new wax rings and move a working shitter to this location.

If problem follows the shitter, you’ve got an internal leak in the throne that’s draining the water down to the trap level.

 

Maybe but probably not. However following code generally gives you good results. Sometimes it is lunacy, but usually it is good practice.

 

Did this. Problem stayed with the bano. So plumbing unfortunately. Mexican contractor actually bought a replacement toilet and problem stayed. He was going to buy another and I suggested we swap a working one instead.

 

Yeah, no codes in Baja, lol.
We are way off grid.

So are these AVV dealios the same as what they put in motorhomes?

 

Are you on septic I assume ?

All other drains in the house functioning?

Are they above or below this location?

 

Any chance they simply left a cap on top of the riser on the roof?

 

We are on septic. The house is all one level. There are a total of 3 vent pipes for various fixtures. All the vent pipes go up in the wall, then horizontal through the ceiling to an exterior wall.
The roof is flat and is used as a patio. We didn't want the stink vented out on the patio.
One vent pipe is for the Casita bano, sink, shower and toilet. Works perfectly. The second vent pipe is for the laundry. Seems to be working also.
The third one has the kitchen sinks, the half bath (leaky toilet) and master bath, two sinks, shower and functioning toilet.
The vent runs from south to north in the ceiling and is vented on the north wall. The kitchen is south, then the half bath and then the master.

Too many traps on one vent? Too far of a run? Shouldn't be horizontal?