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    Africa, Burkina Faso, Ziga region, use of drinking water at the water treatment plant of Ziga — Stock Photo
    Africa, Burkina Faso, Ziga region, use of drinking water at the water treatment plant of Ziga
    Aloe vera gel and fresh aloe leaf — Stock Photo
    Aloe vera gel and fresh aloe leaf
    Aloe vera gel and fresh aloe leaf — Stock Photo
    Aloe vera gel and fresh aloe leaf
    Aloe vera gel and fresh aloe leaf — Stock Photo
    Aloe vera gel and fresh aloe leaf
    Aloe vera gel and fresh aloe leaf — Stock Photo
    Aloe vera gel and fresh aloe leaf
    Woman holding a glass of water — Stock Photo
    Woman holding a glass of water
    Security boat patrolling public water supply — Stock Photo
    Security boat patrolling public water supply
    Fresh aloe leaf with water drops — Stock Photo
    Fresh aloe leaf with water drops
    Aloe vera gel and fresh aloe leaf — Stock Photo
    Aloe vera gel and fresh aloe leaf
    Pieces of Aloe Vera and refreshing drink served in glass jug on the table. — Stock Photo
    Pieces of Aloe Vera and refreshing drink served in glass jug on the table.
    Pieces of fresh green Aloe Vera with white flesh on light background. — Stock Photo
    Pieces of fresh green Aloe Vera with white flesh on light background.
    Two engineers on service boat preparing to take water samples from public water supply — Stock Photo
    Two engineers on service boat preparing to take water samples from public water supply
    Lab chemist preparing automated water test — Stock Photo
    Lab chemist preparing automated water test
    Lab chemist preparing graduated cylinder for standard solution — Stock Photo
    Lab chemist preparing graduated cylinder for standard solution
    Lab chemist placing a sample slide on a microscope stage — Stock Photo
    Lab chemist placing a sample slide on a microscope stage
    Lab chemist handling water sample — Stock Photo
    Lab chemist handling water sample
    Sludge thickeners in a water treatment plant — Stock Photo
    Sludge thickeners in a water treatment plant
    Lab chemist placing paper filter for sample testing — Stock Photo
    Lab chemist placing paper filter for sample testing
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Lab chemist collecting a small amount of liquid with a dropper — Stock Photo
    Lab chemist collecting a small amount of liquid with a dropper
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Lab chemist capturing a digital image of a sample slide on a microscope — Stock Photo
    Lab chemist capturing a digital image of a sample slide on a microscope
    One engineer on computer starting up the water treatment plant in program for supervisory control and data acquisition — Stock Photo
    One engineer on computer starting up the water treatment plant in program for supervisory control and data acquisition
    Engineer installing new membranes in an O2 electrochemical sensor probe in a laboratory — Stock Photo
    Engineer installing new membranes in an O2 electrochemical sensor probe in a laboratory
    Close-up view of sediments on rocks in Riotinto, Huelva — Stock Photo
    Close-up view of sediments on rocks in Riotinto, Huelva
    Industrial valves and a motor in a sludge digester — Stock Photo
    Industrial valves and a motor in a sludge digester
    Engineer connecting O2 electrochemical sensor probe cable to meter in water treatment plant — Stock Photo
    Engineer connecting O2 electrochemical sensor probe cable to meter in water treatment plant
    Engineer recording data at public works control center — Stock Photo
    Engineer recording data at public works control center
    Engineer installing new membranes in an O2 electrochemical sensor probe in a laboratory — Stock Photo
    Engineer installing new membranes in an O2 electrochemical sensor probe in a laboratory
    Two engineers on computers starting up the water treatment plant in program for supervisory control and data acquisition — Stock Photo
    Two engineers on computers starting up the water treatment plant in program for supervisory control and data acquisition
    Engineer rebuilding an O2 electrochemical sensor probe in a laboratory — Stock Photo
    Engineer rebuilding an O2 electrochemical sensor probe in a laboratory
    Engineer rebuilding an O2 electrochemical sensor probe in a laboratory — Stock Photo
    Engineer rebuilding an O2 electrochemical sensor probe in a laboratory
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room
    Engineer installing new membranes in an O2 electrochemical sensor probe in a laboratory — Stock Photo
    Engineer installing new membranes in an O2 electrochemical sensor probe in a laboratory
    Two engineers on computers starting up the water treatment plant in program for supervisory control and data acquisition — Stock Photo
    Two engineers on computers starting up the water treatment plant in program for supervisory control and data acquisition
    Lab technician adding liquid from graduated cylinder to beaker — Stock Photo
    Lab technician adding liquid from graduated cylinder to beaker
    Water treatment engineer in treatment room — Stock Photo
    Water treatment engineer in treatment room
    Engineer polishing O2 electrochemical sensor probe in laboratory — Stock Photo
    Engineer polishing O2 electrochemical sensor probe in laboratory
    Lab technician adding reagent to sample while measuring pH — Stock Photo
    Lab technician adding reagent to sample while measuring pH
    Satellite dish and power transmission towers — Stock Photo
    Satellite dish and power transmission towers
    Lab technician recording data from sample test — Stock Photo
    Lab technician recording data from sample test
    Lab technician adding liquid to graduated cylinder — Stock Photo
    Lab technician adding liquid to graduated cylinder
    Lab technician igniting Bunsen burner — Stock Photo
    Lab technician igniting Bunsen burner
    Lab technician opening sterilization tank — Stock Photo
    Lab technician opening sterilization tank
    Lab technician holding tray of calibrated samples — Stock Photo
    Lab technician holding tray of calibrated samples
    Lab technician using flame test probe to gather sample from vile — Stock Photo
    Lab technician using flame test probe to gather sample from vile
    Lab technician removing sample vial cap — Stock Photo
    Lab technician removing sample vial cap
    Lab technician picking up samples — Stock Photo
    Lab technician picking up samples
    Lab technician holding sample in flame — Stock Photo
    Lab technician holding sample in flame
    Engineer walking by water treatment plant ultraviolet ionization treatment room — Stock Photo
    Engineer walking by water treatment plant ultraviolet ionization treatment room
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room
    Water treatment plant ultraviolet ionization treatment room — Stock Photo
    Water treatment plant ultraviolet ionization treatment room
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room
    Lab technician collecting data on sterilization — Stock Photo
    Lab technician collecting data on sterilization
    Laboratory scientist adding a small amount of solid reagent to a container on a scale — Stock Photo
    Laboratory scientist adding a small amount of solid reagent to a container on a scale
    One engineer on computer starting up the water treatment plant in program for supervisory control and data acquisition — Stock Photo
    One engineer on computer starting up the water treatment plant in program for supervisory control and data acquisition
    Sludge lines in a water treatment plant — Stock Photo
    Sludge lines in a water treatment plant
    Digester tanks in a water treatment plant — Stock Photo
    Digester tanks in a water treatment plant