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Maybe I am dense, but I am unconvinced by the Watch's arguments. I fail to see why telling someone that technology is untested should deter them from exploring that technology?
Additionally, the arumentation that the author of the response letter uses leads me to believe that the author holds some ties to the water district, or another biased party. Maybe I am just cynical, but... touting pledges made by the district as reasoning not to adopt a new technology screams of D.C. style lobbying.