Better Pond Barley Bale Livestock Water Tank Treatment aids in maintaining freshwater in animal water tanks. This treatment is perfect for horses, livestock, cattle, swine, poultry, goats, sheep, fish and exotic animals. This barley bale can also be used for automatic waterers, birdbaths, fountains, stock tanks and ponds. 1 10"X10" bale treats 1,000 gallons for 6 months.