Discoloured grout

[3_fall]

Hi all,
First post so I hope it’s the correct forum.
I have an indoor pool which has been empty for over 3 years.
The grout has been discoloured to a blue green colour, I’m assuming some kind of copper contamination.
Absolutely everything outside of the pool concrete structure itself has now been renewed.
After such a long time empty, I’d there any likely hood of the grout being turned white again thro chemical treatment, or will it simply have to be replaced now after being dry for such a long time.
Thank you in advance for any guidance or educated guesses given.

[Denniswiseman]

Try bleach or muriatic acid and see what happens. You have nothing to lose

[3_fall]

Thank you @Denniswiseman,
Tried those with little or no success unfortunately, but thank you.
Since posting I’ve been directed towards this product which actually seems to work.

‘Swim Fresh’ Total Alkalinity Reducer.

Thank you again.

[Denniswiseman]

TA reducer is an acid

Use these common products to balance your pool
Liquid chlorine (sodium hypochlorite or plain bleach)
Muriatic acid (hydrochloric acid) to lower pH and TA
Bicarbonate of soda to raise TA
Aeration will raise pH only
Soda ash will raise pH and TA

[3_fall]

Thank you @Denniswiseman, that’s very useful information, great stuff, thanks.