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Richard J Kinch wrote:
writes:

Wouldn't this be true of any natural stone material to some degree?
They used travertine on the collesium and Roman forum and while it does
not look like new 2,000 years later, it looks ok.
Are there natural stones that are going to serve my purpose better?

Species like granite have much less water absorption. But you do need to
test a sample or otherwise have it characterized.

Porcelain tile does not have this problem, although the grout does.

Do people use granite around pools? What I mostly see is flagstone,
bluestone, brick and concrete. Are these less porous than travertine
marble I wonder?