Abstract
Water distillation factories are crucial for many nations that depend on them for clean water. However, there are many approaches that can be used. From a business point of view, each of them has its own benefits and drawbacks. While more than one methods can be applied to the same problem some of them are more applicable than the others depending to some factors such as initial cost, operational cost and so on. To solve the section problem, this paper will use the Analytical Hierarchical Process (AHP) approach to rank the different methods based on which parameter is important for individual investors. This is achieved by the use of a simplified custom weight system also proposed in this paper.