PUMPS
Pumps are used for box or wet-dry filters. In the case of marine aquariums, they
are sometimes used merely to circulate the water, or simply surrounded by a block
of foam.
THE REAL POWER OF A PUMP
Here is an example based on a 1,000 liters/hour pump model, capable of reversing
the flow to a height of 1 m: In fact, a very slight curve should be visible, but
the precision here is sufficient to see that the pump has a flow of no more than
600 liters/hour for transporting water to a height of 40 cm.
![](images/pages/3/index.37.jpg)
A pump's power
There are several brands of pump and various levels of power. The power level
is calculated for the operation of a pump that does not raise the water level: the
water is pumped and sent back to the same level.
Manufacturers supply two figures for every pump:
- the maximum flow, which corresponds to a flow reversal height of 0;
- the maximum water height to which the pump can take the water, corresponding
to a flow close to 0.
In some rare cases, the directions for use will include a graph that makes it
possible to calculate the real power corresponding to each height of flow reversal,
but on most occasions you will have to draw this yourself.
![The real power of a pump actually depends on the height of the water.](images/pages/3/index.88.jpg)
The real power of a pump actually depends on the height
of the water.
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