Back flow problem

But the basement toilet doesn't overflow? Is it a lift pump toilet?

Good question, Brian... got me curious, too!

Bigreddogg, could you please share more information on this... very odd description there!

More info. Gets a better answer from us, OK?

Mark

Mark, My thought was maybe we have a block in the main drain and a ejector pump. Shoots up and check valve won't let it back. Lets see what happens next. Brian