
The 3rd generation of EWA's water plants – the Multi-Stages EWA Plant – was patented on November 2008. The basic element of the Multi-Stages plant combines three individual adsorption/desorption units, each located in a separate compartment, connected to a single condenser that enables continuous water production while heat is recovered and transported from one unit to another. The heat released from an exothermic stage is returned to the heat container and provided to an endothermic stage in another compartment.

EWA III uses thermal energy at moderate temperature - 85c. The
energy is transported via a thermal fluid as illustrated here.