Salts must be in water to move through a porous building material via capillary suction. Ions in salt water are surrounded by a shell of water molecules. These hydrated ions are too large to pass through the water repellent barrier caused by the Dry-Treat sealer i.e. the building material will repel the water and the dissolved salts - in particular the very damaging chloride ions.
Freeze-thaw is a phenomena that occurs when water fills up the surface pores of a porous material. When that water freezes due to below zero temperatures the water expands and may 'spall' the surface. A sealer that can provide resistance to salt attack is an excellent indication that it will also protect building material from freeze-thaw attack
