my new element is developing a light green fur/dusty type residue
near the nut like fixings next to the washer on the inside of the
tank. i have only boiled water in the tank so far for an hour or so.
the tank was spotless before this too. i never had this problem with
other similar elements so i dont think its the water supply, there is
no chlorine smell in the water either. the element is the type which
fits in 2 holes and gets secured by two holes on the outside. it is a
nickel plated copper element. when i scrape a bit off it is black
underneath like it is corroded
anybody know what it is, if it is dangerous?