I'm not familiar with that particular model but with most faucets around here the whole chrome piece can be unscrewed.

I'm not familiar with that particular model but with most faucets around here the whole chrome piece can be unscrewed.

Can you put some putty up the faucet, let it dry a little then try turning the glob of putty... Or, try chewing gum.
That's an Ikea faucet, right? I had to do the same thing a couple of days ago. I ended up dremeling (drilling, effectively) two holes in what was left of the aerator, as far apart from each other as I could, and twisted the thing out with some round nose pliers pointing upwards. The top of the aerator is much more solid than the brittle honeycomb below it. I am now waiting for an adapter piece from China that will allow me to screw on a different type of aerator, externally, so to speak, so this can't happen again.
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