What types of natural stone are best to clad an inground swimming pool with?
I have heard that Granite is the best for inground concrete pools, if it is constantly submerged, as it is hardly or not at all porous, which keeps it from collecting debris or cultivating the growth of algae, also does not hold water like a sponge that other more porous rocks may do. Sandstone i’ve heard is ok for waterfall type rocks, not sure on that though.