A white granular powder which when added to water produces a solution which is ideal for unblocking drains or heavy duty cleaning. · · · Cleaning and degreasing · · Powerful fast-acting formula · · The caustic soda is a cost-effective solution for many applications. · · The caustic soda is biodegradable and can be disposed of safely. · · High viscosity formula for quick easy tooling · · Flexible – movement accommodation of +/- 20 %.