The issue with the local sea water is actually not the salinity but more of the contaminants that can be found in the sea water from the erosion of the coastline. I've been using sand from the local beach but In prepping it I rinsed and sifted through it in fresh water and kept it for about a two week period . And it's been in my tank for the last 10 years now with no adverse effects. If you collect the water you would have to be a considerable distance from the shoreline in order to be sure that there were no contaminants from local runoff in that mix that you be adding to your aquarium . There's still no guarantee. Nor really worry it.
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