Just finished reading through your posts:

1. Do not use the Sock-it now. It adds calcium and you're going to be trying to REMOVE calcium.

2. Can you do a white bucket test on your fill water?
  • Take a CLEAN 5 gallon white bucket;
  • fill it with 4 gallons of whatever water you'll use to fill the pool;
  • add 1/4 cup of bleach and 1/8 cup of baking soda; mix and cover;
  • wait 24 hours and inspect to see if there is any sediment on the bottom;
  • wait 24 more hours and inspect again.
  • Tell me what you find -- color and amount.

3. When you refill, lets use ONLY 3 chemicals: bleach, borax and muriatic acid.
Read the muriatic acid page, so you can handle it safely
Add 1 qt of bleach each evening
Use 20 Mule Team borax if the pH gets below 7.0 -- 1/4 box added slowly via the skimmer
Use muriatic acid if the pH gets above 7.6 -- about 1/4 of a gallon jug.
4. If you can buy 1 - 2 lbs of stabilizer at Walmart, do so. Put it in a sock, and hang it in front of a return. If you can't get it here, you can order it from Amazon:
Kem-Tek Stabilizer 4lbs