I have not seen any mention about adding a metal remover chemical when closing the pool. Most closing kits, which I don't use, have some kind of metal remover included. Reading instructions on some closing kits it says to add metal out right before adding the cover and after back flushing. That doesn't make sense. Don't you need to back flush out the metal's? Also if I understand correctly, a metal remover and poly 60 do not work together. I usually sanitize, add poly 60, then cover. How do I remover access metal in water before closing? should this be done before slaming/sanitizing and adding poly 60 to close or not to use at all?