I am skeptical on this idea and money spent. Whatever residual water left behind has more salinity and toxic materials and where do they get dumped? If back in ground, is the ground water not getting polluted more on a longer period of time?

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I am skeptical on this idea and money spent. Whatever residual water left behind has more salinity and toxic materials and where do they get dumped? If back in ground, is the ground water not getting polluted more on a longer period of time?