There are two key point.
Key 1: Drain pipe or Overflow level [locate in Main Tank]
Key 2: Return pump or some kind of pump that deliever water back to Main
Tank [Sump/Refuguium etc].

Key 2 job is to maintain constant level until the Sump / Refugium volume is
either empty or pump can not deliever any water.

Key 1 will return any extra water back to Sump so it will not get overflow
unless there is a blockage.

Note:
Make sure your Main Tank can take extra water if there a problem.

Note 2:
Not recommend Top-Off but to manual add water from a resourvior or storage
tank.

Note 3:
Auto-Shut may not work or can fail and the endless supply of water will
continue flowing to the tank until overflow.

Note 4:
Call up Marc to come to your place to clean your floor when it get flood. He
may make your floor "sparkling clean".


CapFusion,...


"Chimera" wrote in message
m...
Let me take a crack at this.
The return pump/overflow system tries to keep the water level constant
in the tank, and will do so unless there is not enough total water
volume to "complete the circuit".
Any evaporation (or leaks ) will therefore be seen as a drop in the
sump level since the water level in the tank is constant.
Adding water to the sump will not raise the tank level- it just raises
the sump level.

Hope this helps- (I also hope it's correct).