We have two toilets. When one is flushed the other loses water in the bowl. So what is going on here?;):confused:

Probably it's a venting issue. One toilet is creating a vacuum and pulling water from the bowl of the other toilet. You must have air to replace the water flushed. If a vent is partially clogged, air will come from a trap such as your other toilet.

What's the confusion?

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Originally Posted by monkeydue

We have two toilets. When one is flushed the other loses water in the bowl. So what is going on here?;):confused:

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Ron nailed it. This is a clogged vent causing one toilet to vent through through the other suctioning the water out of the bowl. My bet is that the two bathrooms are back to back. The solution would be to snake the lavatory bathroom roof vent. Put out enough cable to reach the base and 20 feet more. Good luck, Tom