Natural stone is safe to use as pool coping on a salt water pool, however, preparation is key.

 

The pool coping should be sealed prior to installation on all six sides (or at a minimum the underneath and the top) with a premium penetrating/impregnating sealer, such as Dry Treat Stain-Proof or Dry-Treat 40SK – see Sealing section. As extra protection, your installer could also use a waterproofing membrane . Regular hosing down of your coping is recommended to wash away any salt crystals that may form.

Waterproofing
Drainage design and waterproofing should be considered prior to installation as part of a broader ‘moisture management plan’. If laying in a damp area and to assist in dealing with efflorescence and other moisture related issues, we recommend coating the substrate (ideally the bedding screed) with a waterproofing compound/membrane prior to tile installation. You can also seal the underside of the coping with a premium impregnating sealer, such as Dry Treat Stain-Proof – see above.