To add to the other answers, Water is sometimes cloudy out of the tap not just because of aerators but for the same reason a glass of water left to sit has air bubbles inside. Your pipes will have that effect on the inside as well while the water sits unused in the pipe as it changes temperature and can dissolve less air. When you turn the water on all the flow pushes the air bubbles up the pipe. If you have a laminar flow nozzle, instead of an aerator it produces a [metaphorical water laser beam](https://imgur.com/gallery/n6z7Z), you will see this effect more clearly since it’s not being obscured by aerators.
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