Regarding #5....I have an 24' AG with iron in my well water. In the future, you will need to add more Metal Out before you add well water to your pool. The key is to keep enough Metal Out in your pool to keep the metals tied up so they won't fall out of solution. Another tip is to add the water directly into your skimmer so that the new water goes through the filter before it goes into your pool. That way, most or (hopefully) all of the metal that falls out of solution will do so into the filter medium instead of onto the pool surfaces. That's a quick answer, and there is more to it....pH and cl levels also play a part....but metal issues can be managed without staining if you learn how. Read everything you can in the metals section of the forum. I'm not an expert, just another pool owner with a similar problem.

Mbar is definitely the metals guru here. She should be able to help you with your current metal problems, and avoiding future problems, BUT she will need you to post your test results. Do as CarlD suggested, get a complete set of numbers and post them, and the great folks here will help you solve the issues you have. It is absolutely solvable and you can do it yourself faster and cheaper than the pool service!