Description These guaranteed organic Barley Straw Pouches are natural and effective against green water algae. Our Organic Barley Straw Pouches can take up to 28 days to start working and thereafter a new pouch added every 3 months will maintain effective control, limiting the future growth of Algae. This treatment is harmless to pets, wildlife and ponds. Bales are approximately 11″ long, and 4″ thick
