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The combination of a low-dose coagulant (polyaluminium chloride—'Floc') and a ballast able to bind phosphate (lanthanum modified bentonite, LMB—'Sink/Lock') have been used successfully to manage cyanobacterial blooms and eutrophication. In a recent 'Floc and Lock' intervention in Lake de Kuil (the Netherlands), cyanobacterial chlorophyll-a was reduced by 90% but, surprisingly, after one week elevated cyanobacterial concentrations were observed again that faded away during following weeks.doi:10.3390/toxins12110700 pmid:33167347 fatcat:qntuaqayz5e4zozloubxt2tquq