The best way to fix a slow-draining toilet is to use a heavy-duty flange plunger (bell plunger with an extended flap) to clear any partial obstructions trapped in the trapway S-bend. Insert the plunger to create a tight airtight seal over the drain opening and pump vigorously 10 to 15 times. If plunging fails, use a professional toilet auger to break apart dense paper masses lodged deeper in the drain line. Verification: Test a bucket flush to ensure the water drops rapidly and drains away cleanly.
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