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Home toilets do not use "suction power" to flush. The inertia of the water falling from the tank when you flush pushes water through the trap and down the drain. If there is any significant amount of blockage in the drain, the water will not be able to move at enough velocity to get past the trap. In other words, if the drain is blocked, water can't flow fast enough to flush. You'll need to get the drain cleaned out to make it flush.

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19y ago

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