This is the third display of the brand I buy is not working properly. Remember that the goal is to display "complete" 100% during filter change and to decrease a stroke every week to show 0 on the day it is necessary to change the filter. But they all display full 100% at the beginning then it no longer works. This decreases a stroke after 20 days or so, and a month after that always show at least 2 black lines!