What was the "cast sea" or "molten sea" יָם מוּצָק specifically used for and by whom?
It appears to be also known as "Yam sheasah Shlomo". https://www.sefaria.org/Yoma.58b?lang=bi
What was it used for, I can imagine, it was, at least, for netillat yadayim, or was that its only use, if at all?
By "whom" I mean, was it only for the priests or for any levites (or could even an israelite use it)?
The "molten sea"-translation יָם מוּצָק is found at Melachim I - I Kings - Chapter 7. https://www.chabad.org/library/bible_cdo/aid/15891/showrashi/true
The "cast sea"-translation יָם מוּצָק is found at Melachim I - I Kings - Chapter 7. https://www.sefaria.org/I_Kings.7.23?lang=bi&with=all&lang2=bi
I want to know what our rabbis of blessed memory wrote about it?
Update and Additions, based on an answer below:
The passage in the TaNaKh uses "rachtzah lakohanim" ( = "washing for the priests"), does it ever mean "mikveh [or tevillah] for the priests"? וְהַיָּ֕ם לְרָחְצָ֥ה לַכֹּהֲנִ֖ים בּֽוֹ https://www.sefaria.org/II_Chronicles.4.6?lang=bi&with=all&lang2=en
"Shlomo ha'Melech built a large, heavily ornamented Mikvah in the Beis ha'Mikdash for the use of the Kohanim." I saw this quote from here https://dafyomi.co.il/yoma/backgrnd/yo-in-058.htm , but I can't tell whether they are quoting a modern-day opinion, that it was built for a Mikvah for Kohanim, or if they are quoting a rabbi from blessed memory, and if so, who? Anybody knows?