Dissolved oxygen is the amount of oxygen dissolved (and hence available to sustain marine life) in a body of water such as a lake, river, or stream. DO is the most important indicator of the health of a water body and its capacity to support a balanced aquatic ecosystem of plants and animals. Waste water containing organic (oxygen consuming) pollutants depletes the dissolved oxygen and may lead to the death of marine organisms.
To conduct a DO test you need to fill this tube with 25mL of water from whatever body of water you wish
to test. You need to break the tip off of another tube inside the tube you filled up with water and wait for a bit. Compare it to the chart and hopefully it is above 3 mg/L. I think there would be more DO in a large river than a small pond.
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