how does caustic soda unblock drains
how does caustic soda unblock drains

The moment the cold water hit the granules, the magic—and the danger—began.

She remembered the white granules under the sink: caustic soda, also known as sodium hydroxide. Her grandmother swore by it, but Marta had always been scared of the warning label:

After fifteen minutes, the hissing stopped. Marta filled the sink with hot tap water, pulled the plug, and watched the water spiral down with a clean, hungry gulp.