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1

I had similar concerns with my home purchase in the U.S. about 7 years ago. It was noted on my home inspection that A tree had been recently removed (long enough ago for grass to re-grow over the area but there was still a depression) from the front yard where the main lines go. I had a plumber run a scope down the lines starting at a basement ...


2

It's difficult to tell for sure based on the photo, but it looks like you're trying to make water flow up hill. It looks like the wall drain for the disposal is too high, which is causing too much water to be in the "trap". I've marked the trap weir in the photo with a blue line, and indicated all the water that will be in the "trap" with blue squiggly ...


4

And the main stack and vent are located about 4ft to left of double sink. It seems you needed your vent to be to the right of the sinks. Although the installation is apparently within code for the length of a single trap arm, when the disposal forces water into the drain it is backfeeding the small sink trap. Having the vent to the right would allow air ...



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