Hello and Help,
I put 2 orange orb/clor no more, (orange is for 20,000 gals) in my pool 7/8/16 and noticed a small staining spot at bottom of wall where it start sloping down to the deep end within a day or two. I think it's from copper. When first used PH 7.8 Alk 90 Chlor .5 - I removed the orbs 7/16/16. Note the day before orbs I used 2 lbs Leslie's calcium chloride powder shock (dissolved) and ran pump overnight.
Is it safe to use vitamin c to see if it's a stain from copper? Another Q is what is the best way to go from here?
Now chlor is .5 to 0 and we added a good dose of algaecide 2 qts Blue Seal brand GROAN Wide Spectrum on 7/16/16. Pool Is 45,000 gals, offset L
Would like to fix this right away, any advice from experience is greatly appreciated.