Having a problem with blanket weed then bermuda banish blanket weed can helpr blanket weed or long string algae is a filamentous algae and thrives in ornamental ponds direct sunlight shallow fast ruinning water over stocking of fish and overfeeding tend to be the main causes for blanket weed developingr bermuda banish is an effective safe to wildlife and fast acting treatment that breaks down the algae without impacted your fishr treats approximately 5000 gallons