My toilet bowl will not fill up. After you flush the toilet you can see the water level in the bowl go down. The toilet is a brand new Kohler. I didn't have a problem with the old toilet but that was an american standard. Any ideas on how to fix this problem? Thanks for your time.

I have two bathrooms back to back in my new store. When I flush one toilet it sucks water from the toilet bowl of the other. How can this problem be corrected? John

How can the water level in the toilet bowl be lowered?

Is there any way to increase the water level in the toilet bowl?

I am not totally unfamiliar with plumbing, but this one has me stumped. I flush the toilet before I go to bed. In the morning the water level in the bowl has dropped a couple of inches. When the toilet is flushed there appears to be an air bubble which comes up, but the toilet flushes almost...