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•Water purifiers are devices that remove impurities from water, making it safe and clean for consumption.•They come in various types, such as gravity-based, RO (reverse osmosis), UV (ultraviolet), and activated carbon filters.•Gravity-based purifiers work on the principle of gravity and do not require electricity, while RO and UV purifiers use electricity to function.•RO purifiers remove dissolved impurities, such as salts and heavy metals, while UV purifiers eliminate bacteria and viruses.•Regular maintenance is essential for the proper functioning of water purifiers, and filters need to be changed periodically to ensure clean and safe water.