faucetkitchen-sink
I need a new aerator for this kitchen tap, but I can't identify the correct type required.
I have a standard fitting that fits the thread, but it doesn't interface with the narrow pipe directly like the old aerator (https://www.amazon.co.uk/gp/aw/d/B08DLWHCD5). This appears to be required, as otherwise water leaks from the thread (there's no where for the normal seal to go in this spout, as the pipe is at an angle).
Is this a standard type of fitting?
There is a seat there on the hot side, unfortunately it has been ground flat. Most (not all) seats have an internal hex shape which facilitates removal with a seat wrench (I cannot tell from your pics if yours does).
You need to pull that seat out and change it. Another (less optimal) alternative would be to "grind and dress" the existing seat, in place. This sometimes works OK and sometimes it does not, and requires a special seat grinder/dresser tool.
Found this image of Jameco tub/shower seats (hex, not square, hole to remove with wrench)
That may be the rest of whatever, though I'm doubtful. But, the aerator will restrict flow, so run the faucet without the aerator at full force with the sink plugged for both hot & cold & see if anything noticeable flushes out. If it seems to clear out whatever then just put the aerator back on & see if it ever returns.
If nothing really produces from the unrestricted run, then it's probably a (or more) bad cone washer in your flexible supply lines under the sink. Those lines are only supposed to be very-very lightly wrenched on.
I suspect yours were way over tightened, which severely damaged the cone washers. They would be splayed out into the water stream & slightly eroded with every use of the faucet. If that's the case then it's nothing dangerous & just an avoidable nuisance.
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