I did use PowerFloc by Biogaurd. After vacuuming a lot of water and refilling, I must say that it looks pretty good. It is still cloudy but very much better. My kids were in the pool today.

The stains have not returned, and it has been 7 days since I started the Vit C treatment. I also got a good kit K-2006 and here are my numbers:

FC=2ppm
CC=3.5
ph=7.0 (added 4# sod carb to bring to 7.4)
alk=100
CH=340

CYA: did not test because water is still cloudy.

My questions are:

When can I Super Chlorinate to rid the CC?
When will the cloudy water become brilliant.
Can I still use Calcium hypochlorite. I have been using straight bleach lately but I find the granular easier to use and takes less space. Also to superchlorinate would require 5 gallons in my 15k ig vinyl pool. I just want to be careful of not increasing my CH.

Thanks for all the help. I am seeing the light at the end of the tunnel.