Blagdon Pond Barley Straw Extract

Naturally clears green water and blanketweed from ponds. This product works at least 1 month quicker than ordinary barley 204 and is far easier to control. The extract provides the by-product of the 204 breakdown that kills algae. Extract of Barley 204 is harmless to all vascular plants and all water born wildlife. 500 ml treats 2000 gallons for 6 weeks