BunnTDO-4 Commercial Iced Tea Dispenser w/Brew-Thru Lid, Oval

I just bought your Bunn ice tea dispenser we wash it out with hot water couple times we put a T in it but the tea taste like metal how do you get meta

Does it keep tea cool, and for how long?

How does this dispense all the tea when the spigot is in the center of the dispenser? What is a "sump dispense valve"? I can't find an answer to this

Does this come with bottom base and the top tea dispenser otherwise two pieced thank you