Need quick confirmation that I'm dealing with iron

[jenmenke]

there are no "spots". I can easily brush the orange away -- it acts like algae. A little slick/slimy if you run your hand over it, but it disappears in a cloud. But if it WERE algae, I'd assume my chlorine regimen would have gotten rid of it.

[PoolDoc]

But if it WERE algae, I'd assume my chlorine regimen would have gotten rid of it.

Mustard algae can be chlorine resistant.

Do the Pool Chart; do the chlorine test I mentioned.

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[jenmenke]

I did do the pool chart. Odd. I guess I'll do it again

[jenmenke]

Mustard algae can be chlorine resistant.

Do the Pool Chart; do the chlorine test I mentioned.
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I'm not sure I understand: you mean sprinkle granular chlorine on to the wispy, easily brushed away orange and then try really hard not to disturb it? Since I only use bleach, I don't have any granular chlorine. Can I crush up a puck? I think I have a few of those. Let me know

[PoolDoc]

I hadn't looked for your chart; I will. If it was there, it still is.

But, a small piece of trichlor will work fine. You can lower it into place with a thread. Just don't leave it there overnight, or anything like that.

[jenmenke]

OK. I put a tricolor tablet directly on top of a corner that had some orange starting to show and two hours later it was mostly gone. So that's algae, and not iron, right? So now what? My guess would be that I didn't keep the chlorine ppm high enough for long enough?

[PoolDoc]

You are correct.

Mustard algae can be eliminated by brushing + very high chlorine, and then continuing high chlorine and brushing after it all seems to be gone.

[jenmenke]

So what is "really high chlorine" for CYA 45 water temp 85?