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Step 1 · Observe and Test Fixtures

Begin by confirming the scope of the problem. A gurgle happens when air is being pulled through a p-trap because of a vacuum in the drain line. Run water in the sink and shower/tub closest to the gurgling toilet for about 30-60 seconds. Listen for any gurgling sounds from the toilet bowl. Next, flush the toilet and listen for gurgling noises coming from the drains of the nearby tub or sink. Based on our assumed answer, running the sink will cause the toilet to gurgle, confirming the blockage is in the shared branch drain line that serves these fixtures.

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Step 1 · Observe and Test Fixtures

Begin by confirming the scope of the problem. A gurgle happens when air is being pulled through a p-trap because of a vacuum in the drain line. Run water in the sink and shower/tub closest to the gurgling toilet for about 30-60 seconds. Listen for any gurgling sounds from the toilet bowl. Next, flush the toilet and listen for gurgling noises coming from the drains of the nearby tub or sink. Based on our assumed answer, running the sink will cause the toilet to gurgle, confirming the blockage is in the shared branch drain line that serves these fixtures.

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How to Diagnose and Fix a Gurgling Toilet

Step 1 of 6·2.6 hr left

1
Observe and Test Fixtures
5 mins2 itemsBeginner
2
Plunge the Toilet
10 mins4 itemsIntermediate
3
Clear with a Toilet Auger
15 mins4 itemsIntermediate
4
Snake the Branch Drain Line
60 mins8 items
5
Check and Clear the Plumbing Vent Stack
45 mins4 items
6
Reinstall Toilet and Final Test
20 mins4 itemsAdvanced
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