Cleaning Drain With Caustic Soda [verified] May 2026

Always add the granules to water, not water to granules, to avoid a violent eruption. And run cold water for a few minutes after the drain clears to flush everything safely.

It worked like a charm. Within 15–20 minutes of pouring the granules down the drain followed by hot water, the blockage completely cleared. The water drained faster than it had in months. It’s cheap, readily available at hardware stores, and far more effective than most over-the-counter liquid drain cleaners. cleaning drain with caustic soda

I used caustic soda to clear a severely clogged kitchen sink drain that was backing up with greasy water. After trying boiling water and a plunger with no luck, I decided to give this a shot. Always add the granules to water, not water