This is a basic tutorial of closing an in ground swimming pool. In this scenario, we are closing a pool with a Pentair heater, pump, and filter, along with an Aqua Genie skimmer system and slide. There are variations to how to close a pool, but these steps not only greatly reduce the chance of freeze breaks, but also preserve the equipment. We HIGHLY recommend testing and balancing the water before closing. We have seen too many people having to replace their gas heaters due to unbalanced water.