Discoloured grout

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3_fall
I'm new here
I'm new here
Posts: 3
Joined: Mon 25 May, 2020 17:07
My Pool: Indoor mosaic tiles.
12.5m long 6m wide, 2.1m deep.

Discoloured grout

Postby 3_fall » Mon 25 May, 2020 17:31

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
Pool Industry Leader
Pool Industry Leader
Posts: 1872
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Discoloured grout

Postby Denniswiseman » Tue 26 May, 2020 06:22

Try bleach or muriatic acid and see what happens. You have nothing to lose
3_fall
I'm new here
I'm new here
Posts: 3
Joined: Mon 25 May, 2020 17:07
My Pool: Indoor mosaic tiles.
12.5m long 6m wide, 2.1m deep.

Re: Discoloured grout

Postby 3_fall » Tue 26 May, 2020 07:35

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
Pool Industry Leader
Pool Industry Leader
Posts: 1872
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Discoloured grout

Postby Denniswiseman » Tue 26 May, 2020 10:50

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
I'm new here
I'm new here
Posts: 3
Joined: Mon 25 May, 2020 17:07
My Pool: Indoor mosaic tiles.
12.5m long 6m wide, 2.1m deep.

Re: Discoloured grout

Postby 3_fall » Wed 27 May, 2020 06:50

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

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