Toilets almost always clog at the siphon curve (the built-in S-bend trapway) located inside the porcelain bowl just past the drain opening. This narrow, curving channel is intentionally engineered to maintain a water seal that blocks sewer gases, but its tight bends make it the primary catch point for dense wads of toilet paper, sanitary products, baby wipes, and solid waste. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when clearing obstructions from the trapway. Verification: Use a flange plunger to apply pressure directly against this siphon curve to dislodge trapped blockages.
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