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 For maximum results, simply soak and flush Powerful action without harming the components in the water system Proven in use world-wide for 3 decades   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 When filling the tank, treat the water with Aqua Clean Tabs