Discuss Grout discolouration in the UK Tiling Forum | Tile Advice Forum area at TilersForums.com

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Hi all, I'm new here, a hobbyist DIY'er, and try to learn the correct and smart ways to tackle home DIY.
Need some help please. I had tiled my bathroom a year ago, it was my first time doing so.
Over that year, where the water hits the tiles, the group has started to grey and discolour, like it's staining.
Some areas where water hits it's ok, but others are bad. I've scraped out the grout once in the bad areas and it's still disclours.
Both times I used the same grout brand/type.
I've attached some images to give an idea on what I mean.
The grout I used was Palace Tile-Grout, in white.

Any ideas what's going on? Theres nothing in the bathgroom used that stains, I've been through the lot.
I'm stumped and peeved on how ugly it gets. I've not used a grout whitener or anything as I don't want to mask the problem.
I've read about sealing, but as the grout iteslf is water based, suitable for bathhrooms, and in wet areas with no indication that sealing is required, I haven't done so.

Thanks in advance
 

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eddcottee

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I dont know what's causing it, but you can get "Mapei Fuga Fresca" in various colours which is a grout reviver, but also you could chose a different colour to what you have at present and change that grout colour to a grey? This wouldn't stain up as easily as the white grout you had.
 
OP
J
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:)
I dont know what's causing it, but you can get "Mapei Fuga Fresca" in various colours which is a grout reviver, but also you could chose a different colour to what you have at present and change that grout colour to a grey? This wouldn't stain up as easily as the white grout you had.
Thats a fair point about the grout colour and did think that too, but me being me, I'd know theres still an underlying problem. Thanks for the idea.
 
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OP
J
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:)
:)

Morning, using strong bleach can destroy the antibacterial properties of the grout allowing mould growth.
Oh, Is that too strong bleach ratio? Incidentally, looking at the Palace grout packaging, it doesn't state any anti-mould/fungal properties.
Could the brown discolouration be cause by some kind of mould/fungus?
The tiling was done by a professional but due to some circumstamces, I had to tackle the grouting and that was the grout he gave me.
 
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