How does overflow work

[drew55]

I currently have a 55 gallon with no overflow, but Sunday I am upgrading to a 210 with overflow. I just have a question on how the overflow works? IF the water levels drop and the water does not flow into the overflow quickly enough and the pump is returning water at 1500 gallons an hour wouldnt the pump run our of water to return to the tank since there would be no water going into the overflow? Thanks Drew

 

[civicss1]

wat do u think....mmmm i think that it would run out of water...but the trick is to not let that happen,,right/??

 

[masson]

The overflow puts water back into the sump... thats the point. Water goes up from the sump and then back down.

 

[whiirly]

very cool explaination Mason