Hi Jean,
These mesh discs and the part they go into - along with a few other small parts - make up what is called "an aerator".
Most aerators simply screw on threads at the end of your faucet. You can remove it by twisting it. You may need a wrench to loosen it first. Wrap the aerator in thick cloth / towel so that the wrench does not dent or scrape the finish on the aerator body.
Some aerators thread up and inside the faucet - rather than at the end - and need a special wrench to remove
Once removed, you should reassemble the parts and reinstall on the faucet. You may find replacement aerators in Home Depot, Lowe's, etc. if you're missing parts, etc. If changing it out, be sure to bring the old one with you to match.
I hope this helps & good luck!
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