If the water drains slowly but isn't clear, you can repeat the process once more. Important Warnings
Do not add more caustic soda or another chemical. Call a plumber – repeated chemical attacks can crack porcelain or damage pipes. unblock toilet caustic soda
Caustic soda is highly corrosive and can cause severe chemical burns to skin and permanent eye damage. If the water drains slowly but isn't clear,
Always add caustic soda to cold water , never the other way around, to avoid an explosive reaction or "splatter". never the other way around