As almost everyone says, I played around with needles and screwdrivers for half an hour and then watched YouTube. They don't have big stores, so this was the quickest way. There are different sizes and unless you have different faucets in different places in your house, you only need one size. The original aerator had dirt that didn't come out quickly so I also installed one of the aerators that came with it and it works great. A waste of sizes you don't need but the simplicity makes it worth the price.
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