Blue with tinges of orange cartridge filter

LindaLouK

New member
Feb 14, 2021
3
Iowa
I checked my fairly new Intex cartridge filter, because we had enough rain to temporarily stop the skimmer from working. It was dark blue, with streaks of orange/amber. I tested for copper, but the test didn't show any present. What else can cause this?
 
What chemicals are you using in your pool?

Post pics of the chemicals showing the ingredients on the labels.
 
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