Puriclean is easy to use, it is simply added to the water system and left to soak for 1 to 12 hours then rinsed. Periodic use will ensure a clean healthy system for water storage. The unique dual-purpose formula which both cleans and sterilises in one easy action. Cleans the complete water system: tank, pipes, pumps, taps. Eradicates bacteria, viruses, biofilm, algae and fungi.