I have a bathroom with two drains on the same line. They drained well before. Now since a drain for the A/C was added to the vent in the attic they do not drain hardly at all. I have the same problem in the master bath with the sink the vent also has a drain for the A/C also. I am thinking the drains are blocking some of the air flow, would that be a good assumption? How do I fix it? Can I put a vent under the sink? Any answers would be greatly appreciated. As I hate to assume (It makes an A@s out of you & me) Thanks in advance for the help!
Putting a pro vent under the sink will work (for the sinks anyway) however it's just slapping a band aid on the real problem. Can you take a picture of how this drain was tied into your vent? They must have done something improperly or dropped something down the vent line to clog it.
I found the problem, I ran a snake through it, it was algae/slime that plugged up the drain. It was so bad on the double sink that I had to run it through the vent on the roof to get it unclogged.
The A/C drain line is hooked in to the vent for the plumbing and I guess that is what caused my problem, will be running my A/C drains to somewhere different to fix that problem, Thanks for the reply back Marlin, I appreciate it.