Gave them a ring this morning, company called mosaic del sur, and they assured me that they are suitable for wetroom installations. However, they also told me not to pre-seal the tiles as it can cause a problem with leaving salt marks on the surface if not fixed, anyone heard of this? They also said that the customer has to expect the tiles to change in nature and appearance over time when water and soaps etc to penetrate the tile especially in hard water areas although this helps with sealing the tiles up. I've decided to install but have made the customer aware of all the potential issues.