110 Gallon Setup Questions!

[Jay_R]

There should be no risk of the siphon not breaking if the water level in the back box is set enough lower then the internal box.
The Risk of a over tank over flow box is Power up from a power outage. This almost always produces air Bubbles that end up collecting in the top of the tube on a over the tank overflow box.. You can minimize this with a uplift pump. This is something that Can NOT Occur with a Properly designed and installed Drilled tank over flow..
The Risk of a leak is the same on either or any tank that is ran to a sump. I Have ran long ago a over the tank over flow box Before uplift pumps and i can tell i have had the siphon break many times due to air Bubbles...
So i would say a OVER The tank over flow could be acceptable with a uplift pump to maintain it... But its riskier then a drilled situation by a long measure

So what you're saying, is if the power fails, the overflow keeps sucking water out of the DT into the sump?

Isn't this remedied by the overflow design accounting for the water level in the DT.. i.e. the DT water level drops below the Siphon intake / intake box and stops the siphon?

I've heard good reviews about the Eshopps overflows not failing post power outtage..