Wow! That is truly bizarre, if the calcium is the well water. OK.
1. Cal hypo is fine in vinyl IF you don't drop it on the liner. (That's not why I want it in the skimmer, but adding it via the skimmer serves the purpose.)
2. You have the Intex SWCG w the copper? Can you disable the copper part? (Regardless: NO, don't start it yet. We need to get everything right, first.)
3. Please test your fill water, directly from whatever source you fill your pool. Please run it for at least 2 MINUTES before you collect a sample, so we're testing what ends up in the pool when you fill for awhile. (Ideally, collect your sample after you've been using water in the house, so the well pump has been running. But STILL run it for 2 minutes.)
[ Just had a thought: could you have rusting pipes putting the iron in the well water? It's just very, very unusual to have calcium and iron in the same well water. ]
4. If you can find a really clean white bucket, fill it with this water, after you collect a sample and then cover it with a towel, to keep dirt and sun out, but not air. Check it after 24 hours, to see what if anything has settled. And THEN test it.
(Don't run CYA test on any of these samples: it will use up your reagent, and you already know there's no CYA in that water. Unless you have a chlorine feed pump, you don't need to check chlorine in the well samples.)
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