dirt stains will not come off

[silverwolf101]

I have a inground fiberglass pool, and i have dirt stains on the bottom of the pool I suspect that it is dirt scale from calcium. i drained my pool and i cant scrub it off any suggestions would be greatly appreciated

.[attachment=0:1qaqbya2]pool bottom.jpg[/attachment:1qaqbya2]


would filling the pool and dropping the ph to 6.0 -7 help??

 

[linen]

Welcome to tfp, silverwolf101

Are the stains rough to the touch?

If not then:

What does a vitamin C tablet and a little water do to a test spot?

What does a trichlor puck and little water do to a test spot?

 

[silverwolf101]

No its not rough really smooth ran a bunch of tests ill post pics below. stopped before i got to muriatic. oh and thank you this place has already yielded some helpfull advice.
.[attachment=1:1qfm32zh]before.jpg[/attachment:1qfm32zh][attachment=0:1qfm32zh]after.jpg[/attachment:1qfm32zh]

 

[duraleigh]

Your tests indicate the stains are organic. Elevate the chlorine in your pool to twice normal and then keep it there, perhaps for several days, and that should get most of it.