If a toilet refuses to unclog despite vigorous plunging, it is usually because the plunger being used is a flat cup sink plunger rather than a bell-shaped flange plunger, failing to create an airtight seal over the drain. Alternatively, the blockage may consist of a hard foreign object, a toy, or a dense mass lodged deep within the trapway that requires a toilet auger. Verification: Ensure your plunger has the fold-out rubber flap extended to create a tight seal over the drain opening.
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