In addition to the cracking and deterioration of porous stone that is made worse by salt splash-out and evaporation leading to recrystallization pressure, there is also the increased metal corrosion rate from the higher conductivity of the water (around 3x or so) due to the higher salt levels and from stainless steel corrosion from chloride attack from its higher level. However, all of these types of problems can be mitigated through use of proper materials or procedures. Porous stone can be sealed or less porous stone used. More corrosion-resistant stainless steel can be used that contains more chromium or a sacrificial anode can be attached to the bonding wire and buried in moist soil.
In some cases, one does not have a choice because a material such as aluminum will be used in header bars and rails for automatic pool covers, for example. For "vanishing" electric safety covers where the aluminum header bar is immersed in the water, a zinc or magnesium sacrificial anode is recommended.

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