What is white stuff on a small copper pipe mean?
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calcium stains
It's probably mineral deposits. Try removing it by soaking paper towels in vinegar and wrapping them around the pipes. Allow the vinegar to work its breakdown magic for at least an hour.
https://diy.stackexchange.com/questions/86004/green-and-white-stuff-on-copper-pipes
It's just Efflorescence. The salts in your water migrate through the pores of the copper and bloom on the outside of the pipe. No worries!
:)
Probably mineral deposits :)