How much water does an air pump move

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Not that simple. The equations to determine the air lift flow rate are exceedingly complex, depending on bubble size, density, column height, head difference and other factors. It’s easier to measure the flow experimentally if you have a way to divert the flow to a cup and use a timer.
 
Not that simple. The equations to determine the air lift flow rate are exceedingly complex, depending on bubble size, density, column height, head difference and other factors. It’s easier to measure the flow experimentally if you have a way to divert the flow to a cup and use a timer.
 
Here is a simple experimental set up you can measure the flow rate of your air lift pump. Turn on the faucet and adjust the flow rate to steady the water level in the jar, which is the flow rate your air lift is pumping. In my example, it is a Marina air lift Breeder Box, but you can improvise the measurement for any pumping systems.

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