As early as the 2007, reverse osmosis plants started to be installed in homes. They were a much cheaper option than...

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Source: http://watertreatmentplant.strikingly.com/blog/reverse-osmosis-water-plant-for-your-home

As early as the 2007, reverse osmosis plants started to be installed in homes. They were a much cheaper option than the distillation units that were in use at the time and used a great deal less energy to run. Reverse osmosis water plant forces water at a high pressure through a membrane that is semi-permeable.