We use the Gas Discharge Visualization Machine or GDV Machine which acts like an advanced kirlian camera that takes pictures of the energy of the water. The structured water that Clay is promoting has the highest energy flow so far of any of the watersout there, including R/O, other filters, and other things claiming to bestructured.  I'm sure there are other ways of measuring structure, but we,the general populace, don't have access to them yet.