**8. Conclusions**

Based on the above explained sections, the following points can be concluded. The most economic and efficient method to get freshwater is desalination. Demisters are the main component of MSFD technique to prevent mixing the distillate by brine. The thermal performance of MED is better than that of MSFD. For example, GOR is 10 and 15 for MSFD and MED, respectively. RO is considered as the most commercial, economic, and efficient techniques of distillation. The economics and technical properties of the desalination method with the targeted quantity of freshwater are the factors based on which we select the distillation technique. Solar distillers are the simplest and easiest way to get potable water, but they suffer from the few yields. The solar distillers can be classified into singleeffect and multi-effect distillers (according to the number of effects of distiller) with a subcategory of active and passive distillers (according to the vaporization heat source) inside every classification.
