Powdered concentrates have largely replaced the liquid concentrates. They are more concentrated, more economical and occupy less space. One ounce of concentrated granules is mixed with one gallon of water to form a fast acting solution. Biodegradable, with no ammonia. Ideal for gold and silver because it attacks and removes rouge and tripoli instantly. Long-lasting, with no evaporation. Saves on shipping costs. Each ounce makes 1 gallon of solution! Each lb. makes 16 gallons.