My house house two bathrooms. One of the toilets flushes fine, the other always flushes slow.
Sometimes everything will go down in one flush, but often needs extra flushes, a bucket of hot water, or a couple of pushes with a plunger. When it does clear, the water empties quickly out of the bowl with a lot of gurgling noise. I snaked it with a closet auger, but couldn't find any obstructions.
I suspect the vent stack to the roof is clogged. Though not really proof, the vent for the toilet that works has a screen/cap on it. The vent for the problem toilet does not, and it's never been cleaned out.
I'd like to clean it out and install a cap on it . I'm looking for the easiest approach - are there any chemical cleaners that are safe to use down the vent stack?