Sweet Tea or northern tea?
For our Sweet Tea, We use a “Black Tea for sweetening” from Superior coffee that is very nice, it comes in a filter pack so that makes it easier.
For our unsweet tea, we use a loose tea in a tea brewing machine that is no cost for us to use.
Important info; Clean and sanitize your tea urns every day, I mean clean them thoroughly and sanitize them with a bleach or Quat solution (I prefer 200 ppm bleach solution) A simple half-assed wipe down will not cut it, disassemble the spigot too.
The reason I say this is that tea brewed onsite has been determined to be harboring a coliform bacteria when not properly brewed and the equipment is improperly sanitized
Also, Dump it after 8 hours,