PAUL RAPSON / SCIENCE PHOTO LIBRARY PAUL RAPSON / SCIENCE PHOTO LIBRARY
Water treatment. Worker turning a valve on the flash mixer tank at a water treatment works. During this stage of treatment, a Polyaluminium Chloride coagulant (PAC) is added to the water, to bind any small particles in suspension. Photographed at the River Itchen Treatment Works, Gaters Mill, Southampton, UK.
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