Pool Cooler Summer Offer- inground pool cooler (pack of 4), Buy 3 and get the 4th for free Decreases the pool water temperature 8-10 degrees. Operating cost is Zero. Easy installation and removal, does not require glue, just slip. Runs with in-ground and above ground pool. Energy efficient . Kids love its mist curtain a lot. Increase the life of pool liners Will fully functional in less than 30 seconds.