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anything regarding the staining of tile or stone including efflorescence

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The microbial staining could also be due to residual organic glue used to face mount or back mount the glass tiles. This glue becomes a source of food for microbial growth.

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Xypex is suppose to waterproof the concrete. So in theory it should prevent moisture migration in the concrete wall to help reduce the possibility of efflorescence.

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This type of staining normally means it is being subjected to moisture, which perpetuates staining of this type when the moisture comes into contact with iron oxides.

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Normally when your sealed Saltillo tiles have a whitish or cloudy appearance, it means that moisture is trapped under the sealer.

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Marble is made of a calcium carbonate material which tends to be more susceptible to staining.

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