Once a frog, mouse, or other animal falls into a pool, they instinctively swim toward the pool wall trying to escape. The animal will circle around the edge of the pool looking for a way out. The animal will bump into the FrogLog, climb up the platform, climb the mesh ramp, and exit the pool. Reduces pool maintenance: Nearly eliminates dealing with dead animals. Keeps water clean by reducing bacteria from animals. Saves native wildlife: Over 95% effective. Easy to use: Simply place and remove in seconds. Safe: Soft materials are safe for children and pool surfaces. Product details: Simply inflate the bladder to a firm consistency and add 1.5 to 2 cups of sand or pea gravel to the plastic bag. Insert the plastic bag into the fabric pouch which velcro closes. Place the floating platform in the water and place the sandbag on the pool deck. An optimal location is just upstream from the flow of water moving toward the skimmer opening. For multiple units, space FrogLogs evenly around the pool. It has been suggested to use a dive belt weight instead of sand.