Don&#x27;t know most system that use that use the cold water for heat exchanging and have a closed &#x2F; open sweet water loop for the actual cooling. But from every thing I&#x27;ve seen salt tends to accumulate on any surface under the right put a lid on a salt water container and the salt will form on the lid just with the internal evaporation&#x2F;condensation cycle through sublimation<p>But there&#x27;s only a handful of such systems in the world
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Deep_water_source_cooling" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Deep_water_source_cooling</a><p>The largest is in Canada and they use sweet water, Norway and Finland have salt water systems that use water from the baltic sea but they seem to be simpler as they pump it into large water reservoirs under the city which won&#x27;t really work for Hawaii.<p>Other limitations like the fact that the US builds with wood and drywall&#x2F;plaster while Europe (and many other parts of the world, which were either deforested centuries ago or wasn&#x27;t that much forested in the 1st place) uses concrete and concrete like blocks&#x2F;materials almost exclusively even for internal walls might make it not that applicable for residential cooling.