Signs of and solutions to a toilet venting problem
If you have air bubbles that rise up through your toilet
bowl (except when it flushes) or notice the water level rising and falling, you
probably have a clogged or improperly vented toilet. This is especially true
when you have an appliance like a clothes washer nearby. Your drain line is
gasping for air.
When you pour liquid from a can, you’ll notice that it
doesn’t flow evenly unless you have a second opening for air. The same holds
true for plumbing. As water goes down a drain, air is needed to equalize the
pressure in the drain line.
This is the purpose of a venting system. If the drain lines
in your home have poor venting (as in Figure A, for example), water rushing
down the drains will pull water from nearby P-traps. The drain in the toilet
bowl is basically a P-trap. If the problem just started, it’s probably a
blocked drain or vent that needs to be “snaked” out. And since the water in the
toilet is dropping and gurgling, it’s likely that the problem is near that
area.
Unfortunately, a clogged or missing vent is tough to fix,
since it usually requires breaking into the walls to examine the drain system.
Unless you have plumbing experience, this project is best left to a
professional.
source: http://www.familyhandyman.com/DIY-Projects/Plumbing/Toilet-Repair/signs-of-poorly-vented-plumbing-drain-lines/View-All
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