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Our experimental set-up consists of a 63 cm glass column with a an inner diameter of 3 2.5 cm, with caps for each end that allow water inflow and outflow. We will fill the tube partially with sand and use a pump to send super-saturated tap water through the tube in a continuous flow (tapwater pressure should be sufficient). The flow will be large enough to suspend the sand particles, as though backwashing a sand filter. Water and any air bubbles that form will flow out of the tube at the top to a collection container open to the atmosphere, where will place the DO probe. The DO probe will monitor the dissolved oxygen content of the out-flowing water to help us determine the effect of the sand filter on dissolved oxygen levels.
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