Copper/Iron other metals??

Jul 3, 2008
13
How does one test for metals like iron and copper if the pool guy's test keeps showing 0ppm?
(I have a previous post titled "First Timer needs guidance" and am dealing with those issues.)
But I'm starting a new one because I believe I have a metal issue since my pool equipment is now more stained with a rust-brown color.
I don't just want to add chemicals like Metal-Out without knowing prior and I haven't found detailed info discussing metals.
Thank you all. We can't make it without you.
 
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