Banish unsightly duckweed from your garden pond with Bermuda Banish Duck Weed. Duck Weed can be a real pain & prevent you from viewing fish & wildlife in your pond. Quick & easy to use, this treatment starves the pesky duck weed of vital nutrients & it will no longer thrive. Remove dead & dying duckweed with a net, do not spray over plants or lilies. 250ml will treat a pond up to 5682 litres/ 1250 gallons in size.