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When there is a white haze on a shower floor it is normally either efflorescence precipitation or you have trapped moisture in the tile assembly by applying a non-breathable sealer over the floor.

Although by definition a porcelain tile is impervious, it can still get dirty. Depending on what kind of texture the tile has on its surface and whether it has micro pores, as many do, some porcelain tiles can have a tendency to collect dirt and not clean easily.

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There are many variables to consider. First you have to know what type of tile was installed. Whether it is a glazed tile (impervious glass-like surface) or unglazed tile (same clay material form top to bottom). If it is an unglazed tile is it porous?

Since you don’t see the purple stain in the pink tile, but you see it in the white tile, and you can’t clean it, it sounds like you have a microbial staining or mineral staining showing through the white tile.

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.

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.

The best counter tops for laboratories that is known to be chemical resistant is soapstone.

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