My faucets in my home seem to invariably have screens on them. It’s almost as if it is trying to stop something from emerging from the tap. But what could possibly emerge from the tap? A baby alligator? A pebble?
FWIW the water where I live is pretty clean. So what is the screen for?
The screen is part of the aerator, and although it will obviously filter out any large enough particulates, its main purpose is not to filter but to help aerate the water stream for the reasons noted in the article.
You mean the kind of metal gauze bit? Those aren’t filters, they are aerators. They help to make the stream of water less splashy, and also reduce water usage while maintaining the sensation of high pressure.
They do also trap bits of rust and debris etc from the pipes, which means they can get blocked up over time.