Many taps have a small grill over the output. This breaks up the water and causes it to mix with the air.
The aerator has a few benefits.
1. It results in faster water coming out of the spout as a result of it being concentrated into a smaller region. This can help with things like cleaning dishes.
2. It reduces the effect of the entire water stream being redirected and absolutely flooding something. Ever accidentally hold a spoon under the tap? It’s so much worse without the aerator.
3. It actually reduces water usage.
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