Sounds expensive to pump it to wide enough area for not to cause issues to marine life. The total amount in context isn't an issue, but the spikes in concentration is.

Probably fine for small-scale use, but on a planetary scale increased salinity could dramatically influence marine biodiversity, not to mention climate from thermohaline circulation disruption [1]

https://oceanservice.noaa.gov/education/tutorial_currents/05...

It's not possible to change ocean salinity by any measurable amount by desalination. Except maybe for some very closed off seas, which are already less saline than the ocean.

To expand on this. There's ~321M cubic MILES of water in the ocean.

Total US water usage is about 2 cubic miles per week - which is not even a 100 millionth of the water in the ocean.

I imagine similar things were said about burning oil and gas at one time.

That aside I think the more pressing concern is the local environment, turning the area around your station into a brackish dead zone.

It is in the water cycle anyway, so yes globally really makes no difference. But the localized levels of salinity certainly can be effected and be detrimental.