According to the article, both the reservoirs are sealed — the brine won't affect salinity in the surrounding water.
Yeah no mention of how it would effect marine ecology is bad, but the avg startup/mega-corp doenst care see how far people are trying to make deep sea mining legal, even with its obvious implications of destroying the sea
Uh, did you get the words mixed up? Perhaps "the avg person doesn't care see how far startup/mega-corps are trying to make deep sea morning legal"?
There's a pretty short video in the article from the company itself that answers all that.
Mentions of efficiency are conspicuously absent from the article.
Another potential problem is marine ecology: pumping high-salt sea water to the top and releasing it en masse might lead to much larger fluctuations in salt concentration than what the ecosystem is used to.
That said, we need many different approaches to solve energy storage, and I hope to be wrong, and that they end up very successful.