Its disingenuous. We know what the theoretical best efficiency of desalination is, by thermodynamics. You can calculate it by assuming a completely ideal revers

Its disingenuous. We know what the theoretical best efficiency of desalination is, by thermodynamics. You can calculate it by assuming a completely ideal reverse osmosis setup. Compared with that, the efficiency would be less than 100%. This article takes 'efficiency' as compared to just evaporating the water and not reclaiming any energy on condensation.