The timer on the lid of your Epic Water Filters Pitcher / Jug notifies you of when you should think about replacing the filter. The timer is set for 90 days as a reminder but depending on use and water quality, the filter may last longer than 90 days or shorter. The timer is there as a reminder and will flash after 90 days to remind you about the filter. If your filter is still working after 6 months, we recommend changing it to ensure maximum filtration.Instructions for use: Press the start button and hold for 3 seconds (the frame will flash 3 times) then let go, the display will start to work. The upper number is the amount of days that have passed. The bars represent the % of estimated filter life based on a 90-day countdown. The lower black dot that is flashing represents that the memory function is working. When adding a replacement filter in the future, press the “Start” button for 8 seconds until the display does not flash anymore. The system will then reset and the timer will start again. To shut off the timer press “Start” for 3 seconds (the frame will flash 3 times) and the timer will shut off. To turn the timer back on, just do the opposite and press the “Start” button for 3 seconds.