JBL Symec Filterwool 500 gFilter wool for aquarium filters to remove all types of water cloudiness. >> Fast removal of all kinds of cloudiness in freshwater and marine aquariums: quality filter wool for aquarium filters. Easy to use: select quantity of wool (suitable for all filters) as required. Insert as last filter stage. Removal required when water flow rate decreases. Crystal clear water: filters off all types of cloudiness and particles. Although rinsing is possible we