Pool FROG is an all-in-one pool sanitizing system that creates Fresh Mineral Water in your swimming pool. The water is cleaner because FROG kills bacteria two ways with minerals and a low level of chlorine. With up to 50% less chlorine used, the pool will feel softer with no smelly odors or faded swimsuits. It's precision performance means you set it and forget it and pre-filled pacs offer no mess, no guess, and no stress pool care.