Very interesting! It seems to me that this is a percolation process where the water is still pure when it reaches the kava, compared to the traditional method prepared in a batch of water containing kava. By maximizing the force of osmosis, this could maximize the attraction of the water, but I didn't expect this to be the case for hydrophobic compounds. Perhaps there's something missing in my reasoning. Are kavalactones so hydrophobic and insoluble in water?