One Sink drains slow

[trewendy]

The left sink (w/o the garbage disposal) drains slower than the right sink. There is to blockage in any of the lines. The black flex hose is hooked up to a air gap vent with a Y to the dishwasher. Any ideas?
Thanks

 

[journeyman]

take pipes apart it is probably at the t or that flex drain which is crap by the way they always get holes in them

 

[PioneerPlumber]

There should only be one p-trap. Here's a picture of what it should look like... More or less. Lol

Off set the stub out coming from the wall with a 45 and aim it as best you can to intersect directly below the center of the left sink. Install the p-trap below the left side of the sink with the open end of the trap directly below the basket strainer.
Install a baffle tee above the p-trap with the branch portion just below level with and aiming towards the disposer. The top of the tee will connect to the basket strainer with a flanged tailpiece.
Good luck homie.

 

[trewendy]

Thanks tried that and did one p-trap, but when the garbage disposal side is full of water and then it is turned on the water comes into the left side sink. It only does that if the garbage disposal is turned on when the sink has standing water in it otherwise both drain fine. Thoughts?

 

[johnjh2o]

Why are you turning on the disposal with a sink full of water? You do need to run water when using the disposal.
There are way to many unnecessary fittings being used on that setup. And throw away that flexible tail piece.

John

 

[journeyman]

the line is clogged at wall if both sinks are filling up especially since you redid p-trap

 

[journeyman]

or that flex pipe is to far inside the tee i recommend go and buying a tubular p-trap to simplify the connections under sink

 

[PioneerPlumber]

Does the tee have a baffle? Is the tee installed upside down? There are too many fittings and connections than necessary and yes, the flexible tail piece is not recommended, however I see nothing that should create a drainage problem other than that tee potentially being upside down.

Also, it is possible you have an obstruction in the drain piping behind the walls or under the floor. It may be diffident to drain under usage and not be able to handle a full sink load of water...

 

[PioneerPlumber]

* Sufficient

 

[trewendy]

The sinks both drain, it just if the sink has too much food in the sink and gets backed up before the garbage disposal is turned on then water comes back up the left sink.

 

[johnjh2o]

I will ask my question again. Why are you turning on the disposal with a sink full of water? The way you should be using the disposal is to feed the food waste into the disposal while running the water.

John

 

[PioneerPlumber]

If I were you I'd throw the disposer away. Food should go into the garbage anyway. I HATE disposers...
I agree with John and check the baffle in the tee...

 

[joelc93]

If I were you I'd throw the disposer away. Food should go into the garbage anyway. I HATE disposers...
I agree with John and check the baffle in the tee...

All they do is clog up traps or the line before the trap they are just a waist of time I agree with old mate

 

[trewendy]

Just wanted to close this out. Thanks to Daniel I was able to figure it out. The baffles were the key. You have to have a “T” with baffles so the two sinks don’t back up in to each other during heavy use (i.e. turning on the garbage disposal). This is what it now looks like with baffles in the “T” and in the proper orientation. Works great.

 

[PioneerPlumber]

Word. Glad to hear everything's working