Thanks very much. The limestone sample we have says it must be sealed. But we're being told that sealing can make it look yellowish. The limestone is capri white. Does it change the color please?

You don't want limestone, or travertine, or any other natural stone, UNLESS you embrace the patina of the inevitable etches, stains, and LIFE lived on it.

Thanks and we do embrace the patina of the inevitable. Truly.! But also want to think this through since we do a lot of entertaining...

There are many many porcelain tiles that look very much like travertine and limestone while having better upkeep, and some of them are textured in a way that would work well by a pool. You might want to look into those alternatives.