What’s this on the wall?

[FLNewsGuy]

Hello experts!

Just finished a SLAM because my filter broke and it took weeks to get even a refurbished replacement. In the interim I had monsterish green icky pond for a while.

The water is now clean and clear but I’m noticing horrific wall staining that won’t go away despite SLAM level maintaining. It looks dark green and blotchy. It’s not something that brushes off. I’m also seeing a small, round orange-yellow stain on the floor. I’m attaching some photos.

Any ideas?

Tests as of today show:

FC = 5
CC = 0
CYA = 0 (post SLAM. Will be adding this weekend)
TA = 70
pH = 7.6
CH = 210 ( a little know but not far out of range. Will add hardener this weekend).

Thank you in as advance!

 

[mknauss]

Put a handful of Vitamin C tablets in a thin sock. Crush them up a bit. Hold the sock on the stains and spot for a few minutes.

If they disappear, it is iron. The spot looks like rebar or a wire tie near the surface.

 

[FLNewsGuy]

How would I get rid of iron stains?

 

[mknauss]

For a large area, you use an Ascorbic Acid Treatment. See Ascorbic Acid Treatment - Further Reading

 

[FLNewsGuy]

Well, it doesn’t look the Vitamin C lessened the stain during the sock test. What might it be if not iron?

 

[FLNewsGuy]

Bumping this. What if it isn’t iron? Anyone know what it could be?

 

[jeffchap]

I assume it won't brush off?

 

[Poolbreh]

It could be copper.

 

[IceShadow]

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