A granular Blackspot treatment designed to clear up even the worst case of blackspot from the surface of white plaster, tiled and pebble Crete pools. Easy to use and incredibly strong the granules are directly sprinkled onto the affected area, not only killing the Blackspot you can see but killing the root deep down in the wall to help prevent a recurrence.
900g/kg Trichloroisocyanuric Acid
Eliminates blackspot easily and quickly including root system
Easy to use
Slow dissolving so more effective