you have to have a sealed jug/container and drill 2-1/4" or whatever holes into the lid then put 2 rigid (can be non-rigid) air lines into the holes. One airline comes from your air pump and pressurizes(sp?) the container and the other one should be as close to the bottom of the container as you can without preventing flow into it. Water will be forced thru the second line and can be fed right into your tank/sump. I imagine he puts it on a timer on intervals that match his evap rate. A float switch is safer, but is more complicated to setup due to the fact that it requires low voltage.
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