ProTeam Zip Chlor is a chlorinating concentrate. This product dissolves immediately and will not cloud water or cause scale. It has 62% available chlorine. The granules are totally soluble. This product is an easy to use strong algae killer. The granule particles dissolve quickly. Using Zip Chlor is a great way to keep your pool sparkling, inviting, and properly sanitized. Best of all, Zip Chlor is made right here in the USA to ensure the highest quality possible, allowing you to buy with confidence.