SUMMIT CHEMICAL BARLEY STRAW 2 BALE PACK THIS STUFF IS MAGIC!!! POND KING RECOMMENDED !! TREATS PONDS UP TO 1000 GALLONS Brand NEW in the Bag Barley Straw is a natural alternative for treating cloudy water in decorative garden and fish ponds. A clear netting holds the barley together without detracting from or harming the pond plants and fish. Calculate approximate water content of pond. Formula: Length x Width x Depth (in feet), divided by 2.31 to give volume in gallons Determine the number of bales required to treat pond. Place bales on the surface of the pond, preferable near waterfall or filter outlet.