Originally Posted by Clownfishlover
I don't think this is the case at most large marine parks. The only SeaWorld park I know that uses natural seawater is San Diego and their orcas get their own specially filtered natural seawater chilled to 55 degree. The dolphins also get seawater, but it goes through the main water filtration they use. SeaWorld Orlando makes their own seawater as well as San Antonio. I also think the Georgia Aquarium uses man made saltwater, but I'm not sure.
Well seeing as I live in So. Cal. I guess that is where I heard it at San Diego.
It seems to be a more economical way to go rather than making/mixing it themselves.