Originally Posted By: rmeyers
This post was automatically imported from our archived forum.
Could also be possible venting problem with the drain system causing water in the trap to be "sucking air". Try checking the vent stack for obstructions.
A few weeks ago I had a long (30') run on an 1-1/2" drain line that was sagging and holding water. When additional water was run through the line it would cause a vacuum on the down side of some improperly vented traps that caused a gurgling and clicking sound of sorts.
Also, never rule out the "strange object down toilet or vent stack"! These come with some very interesting explanations, (if you can find anyone to accept responsibility), like "When it disappeared, I just assumed it went on through." ![icon_rolleyes.gif](upload://iqxt7ABYC2TEBomNkCmZARIrQr6.gif)
Just some additional thoughts on the waste side!