I forgot to mention what my iron levels had been...

When first opened and shocked (water turned opaque brown) iron was 3
After 6 quarts of sequestrant and several days (water was clear/green) iron was 0.5
After adding 6 gals of bleach (water was opaque brown again) we didn't test
After filtering to clear iron was 0
Attempted an ascorbic acid treatment, didn't add anything but acid and 1/2" water (with batting filter in pool and prefilter on hose) for the last 48 hours
Now it's 5

???