Replacement filters are the profit engine of water, air and vacuum appliance businesses, and one of the easiest consumables to counterfeit. This guide explains how NFC tags and tamper-evident labels let manufacturers, retailers and aftermarket sellers confirm genuine filters in seconds, why counterfeit cartridges underperform and create safety risks, where to place tags on filter housings, how NFC data supports filter life tracking and auto-replenishment, and how to design tags for recycling and disposal at end of life.