If you have the Tero device, an indicator light will light up in front of the device to indicate that the filter has reached saturation. Once your charcoal granules and filter have been changed, you must reset the counter by inserting a pointed object into the hole located behind the device. Hold the pointed object for 5 seconds. You will then see the indicator light turn off.
If you have the Tero Plus, the same indicator will light up, but your mobile app connected to your device will also send you a notification.
