Final tip - this is my own personal mantra (and one that makes the pool guys laugh) but my own chemistry-challenged brain sees it thus:
Red (iron/metalic traces in well water)
blue (chlorine/chlorinated water)
--- repeat to self as you wait not-so-patiently for your pool to look normal again!
Also, as long as your water is testing okay, green water from chlorine/well reaction is safe to swim in.
DH told our young daughter she would "turn green like Shrek!" if she swam in it.
Presuming you have this pool because you have young children, just tell the kids you have a special "Shrek Pool" and you'll have the coolest pool in town!