Our toilet "groans" when flushed- it makes a loud noise that does not appear to be correlated with anything I can see. Also, it randomly bubbles and leaves black pulpy residue inside the bowl. Is there an easy fix to this that I am missing?
How to fix a Groaning/bubbling toilet
toilet
Related Solutions
I'm guessing the valve assembly inside the toilet is finding a resonance when it's just about to close. You can replace it, and it's not too difficult of a DIY job. They sell just the valves:
But if you're going to take it apart to replace the valve, I tend to buy the full kit and replace all the guts.
Note that when my toilets started to leak, it was because of high pressure in the water lines. So it wouldn't hurt to pickup a pressure gauge that screws onto a hose faucet to make sure you don't have a bigger issue. After I fixed one, another would start leaking next as the pressure got a little higher.
You have a blockage that is in the main pipe downstream of where toilet and the bathroom drain collect, so it is backing up both of them. Since the chemicals are not doing it, it looks like it has to be augered.
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Best Answer
Check your upstream vents. Drain cleaner or a drain snake usually does the trick! If the vents are okay, you may need to call a plumber.