Yellowish Stain around water level

How do I remove a yellowish stain around the ring of the water level? I've tried brushing it, to no avail.

We didn't "close" our inground pool last year, and this has been a nightmare trying to get it up and running.

We started with a dark green slimy pool, and broken pipes, and after getting the pipes replaced, it's now on it's way to blue, but extremely cloudy, (so much so, that I can't even see the first step).

I've been vacumming and sweeping, but it's hard to know what else is down on the bottom when you can't see!

30,000 gallons, vinyl, inground pool, will post pics if that will help!

Thanks for your help!
 
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