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As noted above, the fill valve is running and the water is going somewhere. It's not going into the overflow and it's not on the floor, ergo it's going into the toilet. Replace that leaky flapper (remember to check the drain for deposits or debris, some reason you're not getting a good seal) and your problem should be solved.
The curve should direct water from the tee joint "downstream" towards the main stack, but if installed backwards it will force drain water (and air) towards "upstream" drains before gravity then pulls it back down the main line. This causes a backwash that slows drains, and yes it can force air in the drain lines past traps like the toilet U-bend.
13.5k 1 19 58. 1. If the OP is getting a big bubble coming out of the siphon jet, it isn't clogged, but a lot of air in the region above it ("A" in your diagram) is getting trapped and forced down the siphon jet. The "A" region has a number of small holes that lead into the bowl in order to rinse down the sides.
As the pipes fill, air may be forced out through the toilet trap causing "bubbles". Since the tub is the lowest drain, the water backs up there first. If you continued to shower, you'd eventually see the toilet overflow as well (if the tub edge is higher than the toilet rim). If the tub was deep enough, you'd eventually see the sink overflow too.
The bubbles are just air bubbles naturally forming at nucleation sites on the foam. If the toilet keeps flowing even though it's already full, you should check your stopcock and or float valve. If the bowl keeps filling from the tank, you should check the tank flapper valve. You should edit your question to include this additional information. –
The problem is, you have an AAV (Studor valve) on the toilet to vent it. This allows air in but does not allow air out. Otherwise you would get a foul smell from sewer gas. So, when the upstairs toilet flushes a large volume of water down the vent stack it forces air up through the toilet since it cannot go up through the AAV.
When the shower gets used for more than a few minutes, the toilet bubbles up and the shower drain slows down again. The shower will eventually drain (very slowly) and when the shower empties, the water in the toilet appears to drop until I can hear air coming in from the bottom. When I use the sink the toilet bubbles up and when I flush the ...
I just replaced the fill valve and flapper in my toilet. Everything looks fine but after a while I see that there are bubbles that accumulate around the flapper and the rubber washers in the toilet tank.
Toilet will not flush and has Air Bubbles. Toilet will not drain when flushed. If I use a plunger for 5 min I can get the water to drain to normal level in the bowl. If I turn on the water to the bathtub and sink both sandwiching the toilet air bubbles begin coming up in the bowl. There are two other full baths in the home working fine.
1. Seeing air bubbles usually indicates a problem with the vent stack that comes out your roof. The vent stack serves as an escape route for any air in the pipe to go when water and poo poo are put into the system. If it's not built correctly, or clogged, the air has to go somewhere, so it eventually makes its way up your drain.