BioGuard Easy Shock & Swim is a tried and true multi-purpose shock, which provides oxidation, clarification, buffering, and flocculation in one easy-to-use product. This product is an excellent choice for all pools, especially above ground models. It is suitable for use with Nature 2 and Frog pool systems. With this product, you can treat and swim in as little as 15 minutes. Easy Shock & Swim will not affect pH levels and there is no premixing required. Nature 2 is a registered trademark of Zodiac Pool Care, Inc. Frog is a registered trademark of King Technology, Inc.