If you choose to use caustic soda, follow these steps to minimize danger: Go to product viewer dialog for this item. Instant Power Crystal Lye Drain Opener
Caustic soda generates intense heat. If you have (plastic), using too much or using it incorrectly can soften the plastic, warp your pipes, or melt the glue holding the joints together. It is generally safer for metal pipes (cast iron or copper), but even metal can suffer if the solution sits too long.
Here is the honest, unfiltered truth about using caustic soda in a shower drain.
