U-Tube Question

[robn70]

Originally Posted by Ilovemytank
http:///forum/post/2835034
definately not true. There is no way possible for water to flow out of that from a small drill hole and it definately will not ruin the flow of water. In fact some of the more expensive and better working overflows already come with this hole. Most of them have where you can stck airline tubing in them or onto them and suck out the air starting the flow of water.
If you drill a hole in the top you will not be able to retain a syphon as the flow of water through the u tube will be pulling air in through the hole. same is true with the cpr overflows when u disconnect the al pump the syphon is broken and air builds up in the top of the overflow.

 

[rwall]

Originally Posted by ;2835454
Stanalee has got it right, move the ball valve to the return pump and use it to adjust the flow rate from the pump, you don't want to restrict your drain line. If you can open the valve all the way with both U-tubes in and you still are getting air in one of the tubes remove one of the tube and then adjust the ball valve so that your DT doesn't overflow. If your sump is running out of water before your DT is full you need to add more water to your sump just make sure you still have enough room in your sump to take all of the water that will drain from the DT when the power goes out. If your tank drains more water than your sump can handle during a power outage try raising your overflow box up.
The ball valve is in the return line.
And no worries...I have no intensions of making a hole in the u-tube