Is there a sealer for flagstone coping on a salt water pool?

Answer from a Stone Person Any natural stone or masonry surrounding a saltwater pools should be sealed for protection to prevent pitting and flaking for the surface called "Spalling", This is caused by saltwater splash-outs penetrating into porous stone or concrete. The product you need is manufactured by DuPont specifically for stone and masonry surrounding saltwater pools. It can be purchased online at the link below http://www.levantinausaec.com/d14226675.html