If the problem just started it s probably a blocked drain or plumbing vent pipe that needs to be snaked out.
Slow drain roof vent.
However if every drain in your house is slow it s possible this is being caused by blocked vent pipes.
When the vent pipe is clogged it shows up within your home in a variety of ways from ghost flushing from your toilet to a sink that won t drain properly.
And slow drains can certainly be an indication that there s something clogging your main sewer pipe.
You will also be able to smell sewer gases in the rooms where the affected fixtures are located.
If you can t clear a slow flowing drain with a plunger auger or drain cleaner the vent blockage may be severe.
If you notice that one or all of your drains are backed up and very sluggish it could indicate a vent issue.
If the water moves slowly from bathtub drains or bathroom sinks the problem could be related to improper or inadequate venting.
Elevated drainpipe pressure prevents water from draining off at an average rate.
How to unclog a toilet vent pipe.
But one of those issues pertains to a clogged plumbing vent.
There could also be a clog in the pipe that services the water flow.
Your vent pipe can become clogged from a variety of things.
Slow drains can stem from several issues.
A single slow drain usually indicates a blockage in the drain itself.
The odor of sewage.
Without air to equalize the pressure the free flow of water through the drain system can be inhibited.
If the vent line is obstructed it can cause a number of problems including.
Slow drainage slow drainage is probably the most common sign of poorly vented drain lines.
Slow clearing drains if the drain just isn t clearing and you ve done everything reasonable to clear a possible clog in the drain your problem may be an obstructed vent pipe.
If the plumbing air vent or vent stack becomes completely blocked a vacuum will form and you will no longer hear gurgling.
The vent system those plumbing pipes that stick out of your roof may be clogged instead.
However if all of the drains in your home are slow and you re also noticing the other issues described in this section blocked sewer vents are more likely to blame.
If the air from the drain or toilet smells like sewage this can also be a sign that the vent pipe is blocked.
The drain in the toilet bowl is basically a p trap.
When tubs and sinks drain slowly it may be an indication of an undersized or blocked vent.