Here's the cycle I've been in this year....
Notice metal stains, reduce chlorine, apply ascorbic acid treatment, shock (pool store chems) to get chlorine back up, notice metal stains, reduce chlorine, ascorbic acid, Pool store shock, etc.....
What I've done: after last AA treatment, added Jack's Purple Stuff as sequestering agent; decided pool store shock might be culprit; committed to BBB, TF Test Kit analysis, TFP "How to Shock Your Pool" methodology.... having completed shock using TFP recommended steps, this morning I notice..... STAINS! I really don't want to continue this cycle. Any ideas?
Current chemical analysis:
FC - 21 (sustained shock level...expect that to come down in sun )
CC - .5
Ph - 7.5
TA - 100 (down from 190)
CH - 410 (down from 800+)
CYA - 80
Borates - 50