This is a white granular powder which when added to water produces a solution which is ideal for unblocking drains and heavy duty cleaning. 

Unblocking Drains or pipes  sprinkle the contents of the pack into 5 litres of cold water and stir with a stick. Take care, as product will heat up.  Pour immediately and carefully down the drain or pipe. After 20-30 minutes flush with boiling water. Repeat if necessary.

Heavy duty cleaning  use same method as above however use approx. 125g of Caustic per 5 litres of water. Rinse areas thoroughly after use with clean fresh water.