Press and hold the STATUS button, but the hold time depends on your filter type.
- Standard white filter: Hold the STATUS button for 2 seconds, then release.
- LONGLAST blue filter: Hold the STATUS button for 6 seconds, then release.
The lights will blink to confirm the correct mode is set. For a standard filter, all lights blink twice then the green STANDARD light blinks three times. For a LONGLAST filter, the green LONGLAST light blinks three times by itself.
If that didn't work, you likely selected the wrong filter mode. Just repeat the process. Make sure you're holding the button down for the full duration for your specific filter.
Heads up: You must do this reset every single time you replace the filter for the indicator to track usage accurately.