I am:
Chlorine
"You’re easy-going and friendly. You work well with others and you’re happiest when you’re helping people less fortunate than yourself."
Great, I am the element that keeps pools from getting gross... 
__________________
"Take me with you,
I don't need shoes to follow,
Bare feet running with you,
Somewhere the rainbow ends, my dear."
- Tori Amos
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