How Does Caustic Soda Unblock Drains !link! -

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:

The drain was silent. And clear.

She poured a cup of the tiny white beads directly into the drain. They looked harmless, like coarse salt. Then, very carefully, she measured a cup of cold water. Not hot, she reminded herself. Never hot. how does caustic soda unblock drains

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. She remembered the white granules under the sink: