Caustic soda is the "nuclear option" for a reason. It works fast, it works well, but it requires a steady hand and a strict adherence to safety protocols. If you are unsure, a professional plumber is always the safer alternative.

when plunging and snaking fail. It works quickly, but the safety risks and potential pipe damage make it less ideal than mechanical methods. If you must use it, follow safety protocols exactly – and never leave it unattended around children or pets.

For a fully blocked sink, try a drain snake first. If that doesn’t work, call a plumber – a professional auger or hydro-jet is safer and often cheaper than repairing chemical-damaged pipes.

Caustic soda clears drains through three primary chemical actions:

While caustic soda is great for eating through grease, it is harsh on certain materials. It is generally safe for modern PVC pipes if used correctly, but it can damage: