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Unread 01-23-2020, 03:22 PM   #1
Michael's tile
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Efflorescence

I installed some brick pavers in a sunroom indoors. After grouting with a dark brown grout(tobacco brown) we cleaned it with some sulfamic acid and the grout joints turned a grey color. I've tried to scrub the joints with a brush and water but they turn back grey when it dries. What can I do to fix this.
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Unread 01-23-2020, 06:43 PM   #2
Tool Guy - Kg
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Welcome to the forum, Michael.

A few questions, if I may:
What makes you think it’s efflorescence?
Was there a bunch of haze that made you clean with the sulfamic acid?
And how long after grouting did you do this?

A picture or two might be helpful.

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Unread 01-23-2020, 11:27 PM   #3
Michael's tile
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I'm not sure if it is efflorescence. We cleaned the tile the day after we grouted it. I think that is why the grout turned. I think we cleaned it too soon. It did have a lot of haze on it. That's why we used the acid.
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Unread 01-23-2020, 11:42 PM   #4
Tool Guy - Kg
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Grout is pretty weak when it’s fresh. Generally, the directions want you to let grout cure for about a week before you expose it to acid. Have you tried the same product again over a small test spot to see if there’s an improvement?

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Unread 01-24-2020, 11:44 AM   #5
Michael's tile
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Yes. We waited about a week and cleaned a small area yesterday and it actually looked good when we left yesterday but when we got here this morning it had turned back grey again. Normally you can scrub the joints a little and it will turn back the original color but it's like the whole joint turned all the way to the bottom or something. I have been doing tile for 20 years. I've grouted a lot of floors but I have never seen one turn like this to where I couldn't clean it off.
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