Hello all, I have been fighting a stain problem for over a year, been using a product called Stainaway (acsorbic acid). The instruction on this product wants you to raise chlorine because stainaway eats up chlorine. After reading post on the list..I know that that info is wrong. I went to W-mart and bought their 6-way test kit so I could start to do things right..with your help.
Here are my numbers...

FC= .8
TC= 1.3
CC=.5
PH= 7.6
TA= 90
Hardness=0
CYA=less than 20ppm...dot did not disappear.

I have a fiberglass pool approximately 13000 gal. Water temperature 88.
Thanks in advance

Ron B. Violett
Memphis Tn