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It probably has no vent. The vent is used to allow air pressure to get around the material that is going down the drain and prevents the water in a p-trap or toilet from being sucked out as the water goes down the drain past it. Sometimes the vent is there but blocked. Sometimes no vent was installed. It can be a serious problem, especially if sewer gas leaks into the home when the toilet makes that noise.

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18y ago
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15y ago

Your sewerline is developing a blockage and needs to be dealt with asap. Get a plumber out to clear the blockage before it gets worse.

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13y ago

The main line going out is getting clogged or has collapsed.

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11y ago

Sounds like they share a common pipe to drain.

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14y ago

Because your drain is blocked.

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