Pour the solution directly into the drain opening. Be careful not to splash. Let it sit for 20 to 30 minutes. Do not look directly down the drain during this time.
How to use caustic soda to unblock drains | Kitchen sink drain cleaner caustic soda drain cleaning
The chemistry behind this is the caustic soda turns the fat sediment into soap and the soap melts in water. Simple. YouTube·SARATA CP TECHNICAL How to Unblock a Drain Using Caustic Soda? - BDS Drainage Pour the solution directly into the drain opening
Caustic soda is highly dangerous. It causes severe burns on contact with skin or eyes, and inhaling its dust or fumes can cause respiratory distress. caustic soda drain cleaning