The H2O Sync app to automate your swimming pool water level control is a companion to your H2O Sync controller and swimming pool sensor. It allows you to: - Setup and configure your controller - Check your pool water level and temperature from wherever you are - Manually add water to the pool if you need for some reason - Bonus! Remotely operate another valve to run water for anything else, like watering your plants, foundation or more. Note, this app is a companion to owning the H2O Sync controller. Do not install it unless you have an H2O Sync controller.