I watched the video first without reading the text and thought, wow, Midjourney has gotten really good, they generated debris in the water exactly like what would happen in real life if the water is reused enough.

Then I started reading the text, and realize it's not an ad for their video generating tool? Cool if each of it can do ~120000 scans per-month. But if I have to step in to a tank filled with debris and discharges from ~3,999 other people (assuming the machine is maintained daily), I think I might have to wear protection and you must not lower me beyond my mouth.

But, if the claim is real, then yea, it could really help. So many health problems can be discovered early with ultrasound scan, only if it can be made easy, cheap and fast. Not sure about resolution and other specs, if it can be as good as CT, then more lives can be saved.

water filtration seems like the easy part

No, water filtration sounds like the first part the device will cheap out on to cut costs.