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dust-looking residue in bathtub

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Thanos

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Hi all,

I was wondering if someone can help me with this:
after I take a shower there is brown dust-looking residue in the tub. Any thoughts what is it? (I am attaching a picture)

Thank you
 

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johnjh2o

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Looks like rust from galvanized water lines. Could be just the nipple used for the tub spout.
 

SHEPLMBR

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Do you have a water softener or neutralizer system?
 
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