Caustic soda is a strong alkali, meaning it has a very high pH. Unlike acidic cleaners, which essentially "melt" pipes to clear pathways, caustic soda works through a process called .
For those who decide to proceed, precision and safety are non-negotiable. First, ensure the area is well-ventilated. Wear heavy-duty rubber gloves (not just disposable ones), chemical splash goggles, and long sleeves. Never use boiling water; instead, use cool or lukewarm water, as hot water can cause the reaction to become explosively violent. Typically, you pour about 3/4 cup of caustic soda directly into the dry drain, followed by about 3 cups of cold water. Stand back immediately, as fumes and splatter may erupt. Let it work for 15–30 minutes, then flush with plenty of cold water. Never use a plunger immediately afterward, as you risk splashing the caustic solution back at yourself. caustic soda drain cleaning
If the sink or tub is full of water, try to bail it out with a cup. Caustic soda works best when it can attack the clog directly rather than diluting in a basin full of water. Caustic soda is a strong alkali, meaning it