These devices are typically installed inline on the water supply line that feeds a washing machine. They function by removing sediment, rust, chlorine, and other impurities from the water entering the appliance. This filtration process can range from simple sediment trapping to more advanced chemical filtration. An example is a whole-house filtration system that benefits all water-using appliances, including washing machines.
Cleaner water benefits both the washing machine and the laundry itself. By reducing mineral buildup, these devices can extend the lifespan of a washing machine by preventing scaling and corrosion within its internal components. Furthermore, filtered water contributes to brighter, cleaner laundry, requiring less detergent and potentially reducing the fading or discoloration of fabrics over time. Historically, the focus was primarily on sediment filtration, but modern solutions address a broader range of water quality concerns.