A pre-filter (only turn the water on half pressure when using it) + (1) pint of metal gone should be sufficient, if when you fill the water is really discolored from Iron/Copper/etc. I would recommend pulling and cleaning the filters 2-3x during the first 24 hours after you've added the metal gone, then once the metal has been removed you can balance alkalinity/pH and start adding your sanitizer to the water...Good Luck!