After a shower the toilet floods and slowly drains during this process the tub gurgles. Could this be the Tom's waxed doughnut or the vent up through the attic/roof? Thank you for your time and expertise!
Why does the toilet fill and slowly drain after showers
toilet
Related Solutions
Your DIY answer is: Call the plumber that installed it.
If that does not work, call your state licencing board, and determine who the bonding agent is for the plumber (it's a licenced plumber, right?)
The hole in question is a siphon jet. It concentrates flow from the tank, jump-starting the siphoning effect.
If you look close (I’m not suggesting you do), there’s a siphon jet hole (see letter G on diagram) in the bottom of the toilet bowl. It’s hard to see unless you put your head in the toilet (For the record, I didn’t do this). When you flush, water shoots out of this hole to fill the drain pipe. This creates a siphon.
When I investigated, it was plugged. Eureka! I cleaned it out and once again heard that perfect flush. -tomlaforce.com
See (acid), How to clean under the narrow toilet rim to restore full flush power
When you flush the toilet in the diagram, the chamber directly above the X fills with water. This chamber is connected to the same passage where the air is, above G. It's also where all the holes are and once they fill with water, the air is forced out through G.
A noticed change may be a clog somewhere but perhaps as the guest toilet, you never realized how poorly it preformed out of the box. IME this is typical of low-flow toilets but also of every toilet that hasn't been flushed in a while.
You may be interested in adjusting or installing a chain float which will hopefully allow enough water to flow after the bubble pops, to create a siphon.
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Best Answer
Gurgling from the tub drain and/or slow draining showing could be from either a partial blockage in the drain line OR a venting issue. However, this should not raise the height of water in the toilet bowl assuming it's at the same floor level. The water level in the tub/shower would have to back up to an equal level for that to happen. Unless of course you're flushing the toilet during or shortly after a shower.