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We solved our own problem. After spending 200-300 on plumbers, we found the problem to be TOO MUCH detergent in the washing machine!!

When I say "chimney" vent, I only mean a vent that is under my sink that looks like a chimney to me. I'm not talking about a vent that goes up through my house out of my roof.

It was just...

No septic. However, I got this answer from a plubmer, via MSN IM:

When my washing machine empties into the washtub, the nearby toilet has recently (about the past four - five months) started to have big air bubbles come out of the toilet bowl, making a very loud...