Clear-Water Barley Straw by Summit is the simplest, most effective method to keep your pond clear of murky pond water. It improves your water quality by releasing oxygenators that maintain the clarity and keep your pond clean, by reducing odors. This safe, natural product will not harm fish or pond plants. Barley Straw will immediately begin to reduce the particles that cause cloudiness, yet it can take up to a month to become completely effective. Each bale lasts for approximately six months. A single mini bale treats 1,000 gallons.