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Water quality scale showing total dissolved solids (TDS) measured in parts per million (ppm) for various nature fresh water sources and filtering technologies, water hardness and contamination levels Wastewater aeration by oxygen supply in water treatment plant Reverse Osmosis. Vector Arts, illustration. Automatic station water disinfection Blue pipelines with oxygen supply for water aeration in an industrial plant Automatic station water disinfection Internal arrangement of biological wastewater treatment sewage tank

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