Latest ATI ICP water test results

I.AM.MR.MIKE

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My latest ATI ICP test shows copper in my fresh RODI water. All of the plumbing to and in my newer home is plastic. Not sure where copper would come from? It wasn't showing in a test 4 months earlier. Not sure it is enough to matter. None in tank sample. POST RODI level 5.81 µg/l not much. All filters new and DI new.
 
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Randy Holmes-Farley

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I don’t think that level is a problem if the aquarium is not elevated, and it may just be error in the test.

If real, it may be from brass fittings upstream of the RO/di.
 
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