To prevent and control growth of algae in ponds
Place Aquafish Pond Algae Block in outside pond. The block will slowly dissolve helping to prevent algae in your pond. One single block will prevent algae in a 20lt pond for a period of two weeks. (All six squares are suitable for a 120lt pond). Pond litres=length cm x width cm x depth cm and divide by 1000.
Suitable for cold and tropical water.