Keeps water in troughs clean and clear for longer. Acts as a natural filter and works up to six months. Cleans water by reducing particles and odors. Safe and natural - will not harm animals, livestock, fish, or plants. Plastic casing keeps barley straw contained. Durable casing lasts longer than messy, loose bales. Treats up to 1,000 gallons per mini-bale for as long as 6 months.