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This ingenious device uses no batteries or electricity and literally runs on water! The water flows through it on it's way to the filter and drives precisely calculated gears inside the device that count down the set # of gallons (set to 500 for our 2, 3 and 4 chamber systems). The meter automatically shuts-off the water flow to the filter system when the set # of gallons is reached, indicating that it’s time to change your cartridges. You are able to see when the meter is approaching end of life and order cartridges sooner.