I think the dutch invented it.
In all reality though it isnt the most simple setup one could choose.
and it makes flushing rather difficult if needed.
Also it would take some time for any change in the rez to take effect, and in fact if the plants hit nutrient lockout, they would stop taking in water, so even if you change the rez, they wouldnt be able to wick up the corrected solution.
So many problems with this system me thinks.