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Cleaning hudrophonics, getting crazy - what is that blue thing

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Cleaning hudrophonics, getting crazy - what is that blue thing

usbmouse 2 Replies 487 Views
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usbmouse

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Cleaning hudrophonics getting crazy   what is that blue thing

What could that possibly be?
I can't clean it, it goes back when dry. Is that something on the pipe/fitting or some metal corrosion or something?
 
Is that copper? Looks like copper corrosion or just mineral build up that needs to be descaled.
 
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