The FrogLog is a highly effective and simple to use invention that solves a pesky problem for swimming pool owners. Today, thousands of pool owners worldwide are using the FrogLog to save animals, keep their pool water clean, and reduce pool maintenance. Customers rave about the simplicity and effectiveness. A few actual reviews: "It really works! After purchasing two Froglogs four years ago, I haven’t had ANY critters perish in the pool! I tell everyone I know about this product. It even rescues baby rabbits." "Our second set! We've had Frog Logs in our pool for the last three summers - and saved the lives of dozens of critters! We used to find bodies of toads and chipmunks on the bottom. No more!" Multiple FrogLog Units are suggested based on the pool size and the abundance of animals found in the pool. Suggested Number of units: 15'-30' pool: 1-2 units 25'-50' pool: 3-4 units Larger pool: 5-9 units