The selling point of this device is that it doesn't need filter changes in the field. Okay. So, how many liters of seawater can in process before it needs an "electromembrane" change?
It's not my field of expertise, maybe I'm just really missing something obvious. Or maybe it's hype and BS tarnishing an otherwise good advancement. Can't tell.
Nothing to wear out. I'm sure it will require cleaning of some sort (what doesn't) but it sounds like the membranes are designed to be a permanent solution with minimal maintenance. Pretty clever!
It doesn't need regular changes, because it's not a filter.
That's also why it's called an "electromembrane" and not a "filter"... Because (can you you hear me in the back) it's not a filter.
If you want technical details in how the device operates, you should probably not be consulting pop sci news articles that are written from press releases... Maybe Wikipedia has an article about it, say https://en.m.wikipedia.org/wiki/Electromembrane_extraction ?