Airlock?

[James Ramsay]

When I flush one of my two toilets, the water in the bowl of the other one moves. I also get air coming out at the end of the flush, sometimes spitting water out of the bowl. Any ideas to what the problem is?

 

[Cacher_Chick]

Has it done this as long as you have been there, or did it not do it before and suddenly started?

 

[Sponsor]

 

[Reach4]

What is the approximate straight-line distance between those two toilets?

 

[James Ramsay]

What is the approximate straight-line distance between those two toilets?

About 40 feet.

 

[James Ramsay]

Has it done this as long as you have been there, or did it not do it before and suddenly started?

We built the house about 2 and a 1/2 years ago it just started about 4 months ago.

 

[Reach4]

About 40 feet.

That was not the answer I expected. I thought you might say 40 inches.

It does sound like a vent problem. Those are not common. I am not a plumber.

You could measure the pressure in the drain lines with a manometer. https://terrylove.com/forums/index....b-drain-stumped-3-plumbers.76371/#post-560269 described making a very inexpensive open air manometer.

 

[Cacher_Chick]

It would be helpful to know the layout of the drain and vent piping. A partial blockage is probable.