Looking for a blanket weed killers and many failed attempts with locally offered funds, I found on the Internet because the means ALGOSOL FORTE from Söll. Within just a few days after the first application has been a very clarifying result revealed come. We were already the reason for our pond albeit blurred, again and the filter pumps were no longer so often added. One too many fish had to the explosion Proliferation of filamentous out. In ca.40-50 cubic meters of water quantity which was to Proplem which thanks Algosol Forte should be none left now.