Max Chlorine PPM for Fiberglass Pools

[scotty5x5]

" Buy some ascorbic acid in a powder form. The label may recommend some sort of 'metal free' also. I added the proper amount of each for my size pool, and the stains disappeared in minutes"

Where would you find ascorbic acid in these quantities and how do you determine a proper dose?
Scott

[mbar]

Here are two links to ascorbic acid:
http://www.chemistrystore.com/Ascorbic_Acid.htm
http://www.msm-msm.com/store/agora.c...scorbic%20Acid
You will need about 1/2 to 1 pound of ascorbic to 10,000 gal.
Feel free to ask any questions on the stain treatment.