On Jun 13, 3:33*am, LM wrote:
It's whitish greenish hard stuff.

Lime (white) plus copper oxide (turquoise-green)?

- splash less (I tried it with and without the aerator. Sure, it made more
noise and had more bubbles with the aerator, but, it seemed to splash about
the same. So, I'd conclude the aerator doesn't do all that much if it's to
prevent splashing.

May be too corroded to work properly then.