Stains not responding to removers

[ftplenn]

I have brownish stains on the floor and the floor edges that I cannot remove. I have a white fiberglass pool and have tried multiple stain removers (sparkle conquest, natural chemistry stain free and united chemicals super stain treat). The stains appear to be spreading to a 4 foot ledge all the way around the pool.

My recent test results are from 7/2/14 am...

FC - 7
CC - 0.5
Ph - 7.4
TA - 100
CH - 300
CYA - 50
Borates - 50

 

[jblizzle]

You need to ID the type of stain to know how to remove it.
Do they feel rough or smooth?

If a vitamin C tablet will lighten them, then it is metal and you need to go through the AA treatment
If a trichlor tablet will lighten them, then it is organic and elevated FC will lighten them.

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