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Toilet doesn't always flush

My upstairs toilet has started to not flush every time. Sometimes it will and sometimes it won't. It's the original 1977 toilet. I can replace it but not sure if the actual toilet is the problem. Could it be the air vent on my roof is plugged? How do you unplug it? Thanks for any advice.

Re: Toilet doesn't always flush

First a 1977 toilet is a water hog by today's standards. Yours is using close to 5 gal. per flush where the new ones use 1.6 gal.
You would be far better off replacing the toilet you have. When toilets get old they get a build up of calcium on the interior sections of the bowl. This doesn't allow the water to enter the bowl fast enough to flush it properly. You can test this by dumping a 5 gal. bucket of water into the bowl at a fast rate. If it flushes good then the bowl needs to be replaced. If not then it may be there is a stoppage in the vent, toilet or the waste line.


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