Sump Ideas

[asylumdown]

have you ever used one of those CPR overflows? How do they work?

In a normal overflow, the rate at which water empties in to the sump depends entirely on how fast the pump is sending it back to the tank. Wouldn't a siphon overflow like that continue to siphon water at a set speed regardless of if the return pump from the sump was running? How do you balance the speed at which water drains via the siphon against what would be a very fickle adjustment of pump return speed?

Maybe I'm missing something, but it seems like it would be very easy to either overflow your sump/continuously lose siphon or accidentally completely drain your sump and overflow your display.

They're a very attractive option as I want to get all the ugly bits like my refugium and hang on the back skimmer for my 20 of the main display and tucked away in a cabinet, but I don't want to buy a whole new tank or mess around with drilling the one I have. Just not sure how they actually run.