All natural Microbe-lift Barley Straw Concentrated Extract is a liquid concentrate barley straw extract specially formulated to Naturally balance pond water and improve clarity. Especially helpful where bottom drains exist. Goes to work on contact. Decomposition process starts immediately. Not harmful to aquatic life, plants, humans or pets. One bottle is equal to multiple barley straw bales with no messy residual. Can be used all year around.