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

Let the solution sit in the drain to work on the blockage.

Here is the honest, unfiltered truth about using caustic soda in a shower drain.

Repeated use can erode the walls of metal pipes, particularly in older homes with cast iron or galvanized steel, leading to "channel rot" and eventual pipe collapse.

: It is generally cheaper to buy in its raw pearl or crystal form than branded "heavy-duty" liquid gel unblockers.