If caustic soda doesn’t clear the drain after two attempts, the blockage is likely non-organic (e.g., a foreign object, collapsed pipe, or tree root). In that case, stop using chemicals and call a plumber – continued use could damage your pipes or leave dangerous standing solution that injures the plumber.
Caustic soda, also known as sodium hydroxide (NaOH), is a highly alkaline substance commonly used for unblocking drains. It's available in various forms, including crystals, powder, or liquid. Caustic soda works by breaking down and dissolving grease, grime, and other organic matter that causes drain blockages. unblocking a drain with caustic soda
Without splashing, pour the solution directly into the blocked drain. If water is standing in the sink or tub, try to remove as much as possible first. If caustic soda doesn’t clear the drain after