Can I increase my overflow by adding a second siphon tube

[Mike7744]

If I add a second u-Tube to my overflow. Can I increase the gallons per hour?
Mine is in E shops overflow rated for a 75gal aquarium i think its 700 gallons per hour. But I think I am barely seeing that and the weir section is full to the top when it's running.

 

[Jekyl]

If you added another would the size of the overflow keep up? My thoughts would be loss of suction for both.

 

[Mike7744]

If you added another would the size of the overflow keep up? My thoughts would be loss of suction for both.

Why would it loose suction?

 

[Jekyl]

Why would it loose suction?

Not enough water in the chamber to keep up.

 

[Mike7744]

Not enough water in the chamber to keep up.

Do you mean not enough water in the weir section?

 

[Mike7744]

Do you mean not enough water in the weir section?

Any other thoughts?

 

[BeanAnimal]

You can add another u-tube but i am not sure why you want one? If the return pump remains the same size, then the flow through each will be half of what was flowing through the single. Moreover, the velocity will be half and this may allow the siphon to break more easily.

 

[exnisstech]

I wouldn't recommend it. The single down pipe will be the limiting factor. And as bean stated there would be no gain. I added larger tubes to my hobs and had a heck of time trying to get the bubble out of the tube. If you need more flow add power heads. JMO I don't even worry about gph.

 

[Mike7744]

You can add another u-tube but i am not sure why you want one? If the return pump remains the same size, then the flow through each will be half of what was flowing through the single. Moreover, the velocity will be half and this may allow the siphon to break more easily.

I have a DC pump, I'm using 60% of flow. So just saying could I turn up the flow with 2 tunes and have the overflow handle it?

 

[BeanAnimal]

I have a DC pump, I'm using 60% of flow. So just saying could I turn up the flow with 2 tunes and have the overflow handle it?

If the current tube cannot handle the flow, then yes adding a second would allow it took up it’s the pump.

 

[Mike7744]

If the current tube cannot handle the flow, then yes adding a second would allow it took up it’s the pump.

Ok thank you

 

[Gtinnel]

It’s already been mentioned but I feel like it’s worth repeating. Adding an extra U-Tube is probably not a good idea. Those U-Tubes rely on flow to carry any bubbles that enter them down and out the other end. If you add a second tube and can’t greatly increase your overall flow then bubbles may collect in the drain tube and eventually break siphon.
Plus if you try to increase your overall flow rate you are possibly going to make the drain very loud. If you increase the flow to where the drain creates a full siphon then breaks siphon you will get a repeating toilet flushing kinda sound.

 

[Mike7744]

Upgraded to a eshopps 1-1/2 u-tube
Rocking the flow now