drilled holes

[SerLunchbox]

So ... I am going to be drilling 3 holes in the back of my tank. All will be 1.5" down from the top of the tank.

2 will be outlets (for a SQWD) and 1 will be an inlet and drain into a sump.

Am I correct in the following. If I have the SQWD hooked up and the tank has 90 degree elbow joints (facing down) that i will not have any issues with water looking to go backwards if the power gets shut off?

Just trying to plan accordingly.

Thanks

 

[melosu58]

Moved to General Hardware and equipment discussion.

 

[Fireworks]

First off, good luck drilling. I just drilled a 2" hole in my sump and it took me three hours to do it.( I was hung over). In the event of a power failure, the water will drain down in your tank untill the siphon is broken and the piping starts to suck in air. Measure from the water level you want to maintain to the top of your return piping and that is how much water will drain down.