Blagdon Wildlife Barley Straw Bugs 250ml is a formula created to treat ponds with green-water, algae and blanketweed issues. This product is easy and quick to use, with natural results. It works like barley straw without the unsightly bales and falls outside of the biocides regulation that removed Barley Straw Extract. It is harmless to filters and all species of pond fish, plants and water using wildlife, and consumes phosphate. It can be used as an initial dose of 1 x 25ml measure for every 909 litres of pond water, with follow-up doses of 1 x 25ml for every 2,841 litres every 14 days. This bottle can treat up to 4,546 litres.