Kitchen sink waste merge two bowl wastes

[akist]

This is a sketch of the waste arrangement under the kitchen sink.

The waste disposer is strong and pushes waste up through the first bowl and the the common overflow.

How can I fix this?

My solution is to separate the two wastes but then I would need another hole in the wall. Not impossible but I'd rather avoid it if I can.

 

[foxhole]

A photo might help , the drawing doesn’t .

 

[jj4091]

Might be worth trying disconnecting W.D from the sink waste and reconnecting where it goes through the wall.

 

[akist]

Might be worth trying disconnecting W.D from the sink waste and reconnecting where it goes through the wall.

Yes I thought that, and was looking for some kind of Y connector but no luck.

But then I looked at the photo and realised it is all bad.

Whilst looking at the photo I saw that the W/D is connected next to the sink and then is the output, so it is logical that it backs up to the sink first.

Also this horizontal "manifold" type thingy can hold a lot of stale and smelly waste and never flush properly.

 

[flameport]

Grey shiny plastic wastes = ikea crap alert.

Sling the entire lot away and replace with McAlpine or similar.

 

[denso13]

The waste disposer is strong and pushes waste up through the first bowl and the the common overflow.

Has it always done it since installation?

 

[Madrab]

The waste disposer is strong and pushes waste up through the first bowl and the the common overflow.

It sure would, it has, in effect a pumped outflow. Not surprised it's doing it given the way that waste is all setup. As suggested, get rid of that multibowl grey waste, it is one of the reasons for the issue.

Run a single trap off of the left hand sink and then a new waste pipe run back and down then bend into a horizontal, then add in a tee and then onto the elbow onto the outflow through the wall. Then run the macerator back and down into the swept arm of the tee to promote the flow towards the outflow.