What if there's no cartridge replacement notice even after a year?

The display screen on the LeveLuk will notify you when the total volume of water produced reaches 1,500 gallons. The microcomputer controls this notification mechanism, please make sure to press the reset switch to activate the microcomputer when you put in a new filter. The reset switch is located on the top right of the cartridge section (inside the black cover on the left). Please press it until it beeps. The microcomputer controls other information for the LeveLuk as well, which is why it is critical to remember to press the reset button.