Barley Straw Bags: Completely harmless to plants,
fish and wildlife and biodegradable. The bags contain barley straw and
cotton and they are used to clear algae and suppress weeds in ponds. Each
bag will treat a 10 sqm area of pond. These bags work perfectly in ponds
and in water features, and they can also be used to clear harvested rainwater
in a water butt. Each pack contains 2 bags.