Recycling water after it is used. Often it has to pass a wastewater purification system before it can be reused. The process of Recirculation occurs when there is a re emergence of liquids within the circulation cycle. What results from this process is a decrease in operational costs and an increase in productivity. Recirculation works by utilizing one water supply multiple times in a system in the form of reusing the water in the same specific kind or in another system.