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I have the following type of faucet aerator:

faucet aerator under

I tried to "unscrew" this one, but it seems not screwed at all; it just spins. Is there any way to remove this? As it is a separate part, there must be a way to remove it. Please help.

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When you say "it just slips", do you mean that it just spins, or that you can't get a grip on it and your tool is slipping? – Steven Mar 31 '12 at 2:38
@Steven it just spins. grip is not a problem, yet. – Chang Mar 31 '12 at 15:49
Have you tried pulling down? I'm wondering if maybe there is an outer ring – Steven Mar 31 '12 at 15:53
From the second photo, it looks like you need a special tool to go in those notches on either side of the aerator, unless those notches spin freely too. – BMitch Mar 31 '12 at 18:16
Bmitch is right. You need a spanner wrench or some narrow pointed needle nose pliers to get into those notches. – shirlock homes Apr 1 '12 at 11:34

A bit late, but for anyone still wondering I had this problem today. I took two forks and put one prong on each into those little notches and turned counter clockwise until I felt it becoming loose. At that point, I just had to unscrew it a bit more and it came off.

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Wrap a rag around it and grab it with a pair of pliers. The rag will protect the finish. If you can't get a good enough grip on it, just use the pliers then buy a new aerator. If you mean that it keeps turning in the thread, then the threads are stripped and it's time for a new faucet.

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this one has an internal threaded cartridge, outside spins. – shirlock homes Apr 1 '12 at 19:54

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