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Slow or incomplete flushing. Without proper venting, the water is pulling against a vacuum.

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Q: What does a clogged toilet vent cause?
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Related questions

Why would air bubbles come up in downstairs toilet when upstairs toilet is flushed?

partially clogged drain or vent, improperly installed vent or drain


Why would an American Standard toilet overflow after you flush?

Clogged drain or toilet. Also check the vent holes under the rim and clean the out.


Would a clogged stink pipe cause a bathroom sink to not drain?

Yes a clogged VENT pipe can cause a sluggish drain


What causes water in commode to gurgle?

Drain is partially clogged or the vent pipe is stopped up. Also check the vent holes underneath the rim of the toilet and clean them out.


What can cause a new toilet that has replaced an old one to periodically have a sewer smell?

It could be a bad wax ring. I would start by replacing that. also check the vent on the roof to see if it is clogged with anything


When you take a shower your toilet bowl drains-- why is that?

This could be caused by either a clogged vent line or lack of vent to outside atmosphere. It sounds like your drainage system is starving for air and is trying to pull air from the path of least resistance, the toilet. Also, it may be caused by the drain line itself being partially clogged


Your toilet bubbles when flushing and drains slowly?

Toilets that bubble when flushed and drain slowly can be cause by different things, such as port holes that are clogged, a clogged drain line, the tank has a low water level, or a problem in the vent pipe. A plumber can check for the specific problem and fix it.


Where is the vent hole located on the toilet?

Vent hole or holes are located under rim of toilet.Best way to see it is with small mirror.Take clothes hanger and make sure all holes especially the large ones are not clogged .They will become clogged from time to time.


Is something wrong when the toilet gurgles when the bathtub is draining when you are on a well and septic system?

When a basin drains and causes gurgling sounds in other basins -- or the toilet, in this case -- it is usually a sign that a vent pipe is clogged or obstructed. The air being displaced in the drain pipe of the bathtub has nowhere to go if the vent is clogged and is being forced up through other drain pipes.


can a clogged vent pipe cause leaking onto the roof and bust a joint in the sewer line?

Yes


If you have a single story house with 2 toilets but only 1 vent and sometimes water in the toilet bowl is reduced to half how do you fix this problem?

Your problem can be caused by problems other than improper venting. A bad fill valve, a cracked toilet, a partially clogged toilet, or even a clogged drain line. Has this problem just started or has it been as long as you can recall. If it is an old problem it may be vent related... new it is most definitly something else.


How do I know if my vent dryer is clogged?

If your vent dryer is clogged there will be no heat coming out. It will also take longer for things to dry.