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Why can pouring boiling water or liquid caustic chemical lye (sodium hydroxide) into a clogged toilet bowl cause catastrophic damage?

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 Correct IncorrectThermal shock from boiling water can crack the cold porcelain toilet bowl in half, and caustic lye attacks wax ring seals while creating hazardous splashing when snaked.

Why can pouring boiling water or liquid caustic chemical lye (sodium hydroxide) into a clogged toilet bowl cause catastrophic damage?

• It turns the water into vinegar
• It makes the toilet siphon backwards
• It melts the copper vent pipe on the roof
• Extreme thermal shock can shatter the cold porcelain bowl, and chemicals destroy wax rings while creating chemical splash hazards for plumbers