Slow Tub Drainage & Toilet Backup/Bubbles
I've read a couple of different posts that have similar problems but none that combine all of them. We live in a one-story rented house.
It started with bubbles coming up from both toilets when we used the shower two days ago. I tried to flush one toilet after a shower yesterday and it overflowed even though there was nothing being flushed. But! If it has been awhile since anyone took a shower or bath then the toilet flushes just fine.
Today, I noticed that my shower didn't drain quickly enough (still having bubbles during the shower). After my wife took a bath tonight, (it's been an hour and is still draining) the second bathroom's tub started to fill up with nasty, brown water.
I've got two theories based off my online reading: It's the vent (we've got plenty of animals and falling leaves around the house) or it's a clog between the toilet and the main line.
Please help!