CrystalClear Nature's Choice Barley Straw Pellets utilize barley degradation technology to help manage ponds all year long. When placed in an area of steady water flow CrystalClear Nature's Choice will slowly degrade and emit a natural chemical that cleans and polishes pond water naturally. Simply fill the included application mesh bag with the corresponding application rate and place bag in the pond in an area of water movement. Replace barley straw pellets every 3 months. Apply 1 pound for every 1,000 gallons.