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In a June 29, 2017 photo, The Clearas Water Recovery greenhouse glows purple from the LED grow lights for the algae held in glass tubes near the settling ponds in Missoula's wastewater treatment facility. Clearas has developed a patented process to use the algae to remove nitrogen and phosphorous from the plant's waste water, keeping waterways, like Missoula's Clark Fork River, free from the compounds that starve fish and plant life of oxygen by feeding algae in the river. (Tommy Martino/The Missoulian via AP)

In a June 29, 2017 photo, The Clearas Water Recovery greenhouse glows purple from the LED grow lights for the algae held in glass tubes near the settling ponds in Missoula's wastewater treatment facility. Clearas has developed a patented process to use the algae to remove nitrogen and phosphorous from the plant's waste water, keeping waterways, like Missoula's Clark Fork River, free from the compounds that starve fish and plant life of oxygen by feeding algae in the river. (Tommy Martino/The Missoulian via AP)

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