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:
When the plunger fails and the boiling water does nothing, it is time to bring out the heavy artillery. Caustic soda (sodium hydroxide) is one of the most effective DIY solutions for clearing stubborn blockages caused by fat, grease, and organic buildup. caustic soda blocked sink