Refugium Return DIY - Help!!!

[jpc763]

I had to replace the pump in my fuge so I built a whole new return system with a ball valve (more powerful pump). Anyway, everything works great except when I cut power and the system siphons the water out of my tank overflowing my fuge (almost before I figured out what was happening)!
My old return line had a small hole in it. I assume that is the problem. Where should I drill a hole in this system?
Here is a pic.

 

[jpc763]

So I think the hole is the problem. 3 questions...
1) I need a hole. Am I right?
2) If so, where?
3) How big of a hole?

 

[fishyfrenzy]

You should drill a hole right above the water line, where a stream of water comes out.
A moderatly large hole. about the size of an eraser on a pencil

 

[turningtim]

Here ya go.....

 

[jpc763]

Thanks for the tip! Worked like a champ! John

 

[peckhead]

i think the hole should be above teh water line..

 

[jpc763]

It actually does not matter too much. You need it close enough to the water line so that the siphon is broken before you overflow your sump/fuge.
My hole is actually at the water line as that is where I have tubing instead of pipe.

 

[donald]

If you put the outlet just below the water line then it will break the siphon when the water gets to it and you won't need a hole. Just make sure the out let is just below the water line