I have a kitchen sink that is recently backing up when I run the sink. I ran the garbage disposal thinking this would solve the problem but once I turn off water (lots) bubbled up into the sink. If I just leave it, the water does drain out. And in fact I thought the problem was fixed because I rapidly poured a whole kettle of boiling water down the sink and it all quickly flowed down the drain. I reheated kettle and repeated 5 times. We even ran the dishwasher over night and as far as I can tell, it got the dishes clean and didn't back up (no water in dishwasher). But when I turned on the sink and the garbage disposal in the morning, same problem. Water comes gurgling up.
I'd like to know
- Why do things seem worse when using garbage disposal?
- What's going on and how do I fix it?
I did see this article: Water backs up in adjacent sink only when garbage disposal is used
and maybe that addresses my problem? But note that I just have a single drain not a double one.
Update. Photo shows plumbing under sink. Notice I was able to undo bottom connection of trap but NOT top connection. I unscrewed the fastener. Should it just pull down now? For the life of me, I can't budge it. AND I may have caused leak from pulling/twisting. Seemed like water was coming out when I ran garbage disposal right now metal fattener on outside of disposal (connector to tube) Adding photos as requested: