Do I have metal problems?

[waterbear]

That makes sense. I guess I could have them check my fill water, but I know it's metallic b/c the Vit C test. Anyway, I guess I will try and clear up the water (which now looks like a pond) first and then address my stains. Could the pool store lady be right? - change my sand every 2-3 years?. It just seems like the sand would continue to filter if you keep it backwashed.
Thanks again to the forum.

As far as changing the sand...it is possible that metals have deposited on the sand as 'stain'. If they have they can redissolve in the water given the right conditions. I would inspect the sand and look for evidence of staining. If there is a lot of it I would change the sand..otherwise I wouldn't. A commercial sand cleaner might also be an option to remove the metal stain from the sand if it is present. IF the metal has stained the filter material it is a good thing...it mean that you can actually remove them from the pool easily! Ideally, you want the metals to stain the filter and not the pool for this reason.