It does certainly sound like you have metals from your well water. You can try the drain and refill, however I would add the sequestering agent (metal out) before you start to add the water from your faucet. You also need to have your other chemistry numbers because if the ph is high - then when you add chlorine, the combination of high chlorine and high ph is what causes the metals to fall out of solution. The sequestering agent is what binds with the metals to keep them in suspension. Some people who have had really badly colored water added a flocculant, turned off the filter and then let the rust fall to the bottom of the pool and then vacuum it out. I have never tried this, but I have not ever had discolored water, just stains. I'm sorry I don't have a better answer for you, but I would try the metal out and the drain first. Let me know how you do, so we can all learn from each other.