This was indeed a test: the volume of water was about two cups of water (a bit less than 500mL). The article does not say what the concentration of the chemicals in that water was.

However, it does sound like it can be applied on a larger scale fairly easily.

>“The advantage of this technology is that it is very sustainable,” Liu said. He noted that hydrogen that is introduced into contaminated sources during the process becomes harmless water at the end of the reaction. 

>At this point, the system is still in an early phase of research, but the team hopes to eventually develop it into a commercially viable machine that could zap PFAS compounds out of large water tanks, and other sources.  

>“The hydrogen-based polarization technique may be readily applied to other water ionization systems to enhance reductive destruction of PFAS and other contaminants,” the researchers concluded in the study.