How do I disconnect the Koralia WiFi device from my "Home" Wifi Hub?

Unpair the Koralia WiFi  device from the app: from the main menu, press “MANAGE” and select the device you wish to unpair from the list. Press the gear icon symbol for the settings of that device and press “UNPAIR DEVICE”.
Press and hold the controller push button for 10 seconds.
Re-pair the device to the application, as you would for a New product.
Remember that while the device is paired with a household network, you will be able to operate it only with the Hydor account you have paired it with.