I've tried 3x, but haven't been able to reach them.

I'll have to call this evening (for me -- they are in Calif).

I've re-read their literature, and am not sure what's happening. One & 1/2 quart of 20% HEDP is not high enough so I would expect calcium problems, though it is higher than I would have thought they'd put on their label. But, they are calling the product "calcium eliminator" -- that's par for the course for HEPD products, even though they don't "eliminate" anything -- they just dissolve it. But, it's possible that they did add something that will "eliminate" calcium, such as STPP. It's non-toxic, so they don't have to list it.

Even so, that doesn't explain what's happened, since commonly, wells with iron have ZERO calcium.

For now, DO lower the pH and DO keep filtering. Ironically, if they have done something that has precipitated calcium, once the iron's re-dissolved, the calcium products on the filter (as they filter out) WILL help REMOVE the iron from the pool. So, it may work out for the best. But, until I find out what ELSE is in that product, I'm guessing.

This is one of those times when I wish I had a "PoolForum" line of plain un-mixed chemicals for sale, so I could be SURE of what was going into people's pools!

Ben