How will tumbled quartz hold up as a waterline tile? Its pool grade. Pool is salt. Will be used by kids. Don't want shedding of the material in the water. Also, you cant tell in the photo but it has sparkle in it. Will the sparkle disappear from the salt and chemicals? Im thinking it may only be on the top layer.Photo attached and link to manufacturers page for the tile. Also, what color grout would you use for it to not be obvious grouting (coping is ivory)?
universalpooltile.com
Thanks 
Tumble Stone Archives - Universal Pool Tile
A delightful natural stone tile, the Tumble Stone features graceful earth tones and a wide range of textures and hues. Perfect for waterline, raised bond beam or any backyard amenity, this is the perfect fit for your So Cal lifestyle.
