Caustic Soda | For Drains |link|

Modern PVC pipes can usually handle the heat, but very old, thin plastic pipes or low-quality joints may soften or leak.

If there is standing water in the sink, adding chemicals can be dangerous as you can't flush them through, leaving a pool of corrosive liquid. Maintenance Tip caustic soda for drains

Elias stared at the backed-up kitchen sink with the grim resignation of a man who had tried everything else. He had plunged until his shoulders ached. He had used the plastic drain snake, retrieving nothing but sludge and despair. He had even poured that foaming, bubbling "miracle gel" down the pipe, which smelled like artificial lemons and did absolutely nothing to stop the rising water. Modern PVC pipes can usually handle the heat,

Boil a kettle and flush the drain with hot water. If the blockage was significant, you might see the water suddenly "drop" as the path clears. If the drain is still slow, you can repeat the process once more. When NOT to Use Caustic Soda He had plunged until his shoulders ached

The water in the sink began to spin. The heat radiating from the steam made the air shimmer. It was a terrifying thought—that something could be so quiet on the shelf, yet so ferocious when introduced to the right environment.

Elias watched the water swirl away, leaving the stainless steel shiny and clean. He held his hand over the drain; the pipe was still radiating a faint warmth, the final echo of the chemical battle.

He pulled the bottle out. The weight of it was surprising—dense, heavy pellets of pure sodium hydroxide. The label was terrifying in its simplicity. Corrosive. Causes severe burns. Do not mix with other chemicals.