Adjust the handle on the base filtration system to activate and deactivate the filter. If you leave the filter unused, the bacteria will start growing, and the filter will not work efficiently. Why Brita Faucet Filter Light Is Not Working What Should You Do What to do if filter replacement indicator does not reset How does a brita sink filter work . Yet, only a few understand how it actually works. If you have a culligan filtration system installed on your water lines you do not necessarily need the brita. On average, it takes your brita water filter 10 to 15 minutes to purify a pitcher of your drinking water. One of those parts is the filter indicator. How does the brita faucet filter indicator work? The mesh holds all the ingredients together, leaving the water flow out from the tiny, porous surface. Surprisingly, most people know what it does, alerting us when we need to change the filter. All faucet filters can feel a little unwieldy at first, but the pur less...