Did you ever put in the original amount of CYA to get to 30 PPM via the sock method. If not, one cup of CYA is not even 6ppm of CYA.
Let us know --
Take care.
I did the sock method. It was actually 2 cups, which is probably not enough. It is MUCH MUCH more than what is said behind the container though... I guess I should add more...
Pool math says 42 oz of stabilizer. I would need more than one sock for that much powder lol!