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The black stain in the water has to be coming from somewhere and caused by something. The question is where and what?

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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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First of all you don’t really need to seal your grout. I assume it is a cementitious grout, which is porous. Put generally speaking you don’t have to seal it. It will get darker over time whether you seal it or not, but it will be easier to clean and will less likely stain if you do seal it.

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