On Oct 1, 7:04 pm, Red wrote:
Edwin Pawlowski wrote:

Dump some water down the toilet also as the trap is dried out.

Which brings to mind a question. There was a rarely used building with
bathrooms & on a sewer system. When we went in there after months of
unuse, the commodes were empty & smelling. With the first flush there
was always a moderate "boom". Never did figure out why it did that.
Any ideas?

Red

Air trieing to get out of the pipe