we have had a lot of rain.... my pool is developing algae on the walls and floor and although the water is not green, i am seeing a slight, very slight green tint. i'm not sure what to add and in what steps. i have a 21,000 inground, sand filter.
pool store results yesterday:
TC: 3.1
FC: 3.1
ph: 8
ta: 159
Copper: .1
iron: .1
The pool store did not test for CYA, said they don't do that for pools treated with chlorine!

my results today using taylor 2006 test kit:
FC: 15
CC: 0
TA: 140
ph: 7.6
CYA: 20
also i have developed more staining, that in the past has came off using the absorbic acid, but tonight they do not. it may be a metal stain, not sure.

I know if i treat for metal i can't shock for a week, so i'm concerned about doing that since i am developing algae...so please advise as to what I should do? i don't want my pool turning green! Please let me know as soon as you can! Thanks!