Help Needed with Clogged Air Vent Drain Pipe and ? on Dishwasher Drain Pipe Answered
I need help and learning how to remove, de-clog, etc.
The picture is my kitchen sink drain area. I have two-sink with the right side having a garbage disposal, with connecting pipes leading out. But then, I have another pipe leading out in the same direction, but it serving as an air vent pipe. There's a cooper pipe leading up and into the air vent pipe.
Prior to taking the picture, my dishwasher's drainage pipe was connected to the bottom of the cooper pipe. Well, last night I've noticed my sinks were clogged, I ran the garbage disposal, and then the a gush of garbage water came out of the under sink cabinet.
Well, after a lot of cleaning, this morning I removed the drainage pipe from the sinks, and noticed that my air vent pipe was gushing out the garbage water.
After searching the internet, it's rare to have a clogged air vent, but at the same time, no one seems to install the dishwasher drainage pipe into the air vent pipe.
So my questions are:
1) Should my dishwasher drainage pipe be connected to the upper part of the garbage disposal? (You can see there's a fitting on the disposal right above the white PVC pipe leading out of the disposal.)
2) Why would they (the original builders) install the dishwasher drain pipe into the air vent pipe?
3) Most importantly, how do I go about in unclogging the air vent pipe? (It's all bonded together versus having a washers and nuts or a threaded union.)
4) Any answers and questions that I don't know what to ask? Insights/suggestions?
Please and thank you.