Herbie with 1 hole each in 2 overflow box/weirs possible?

[OrlandoAIOReef]

Have a tank I’m trying to plumb with 2 overflow boxes/weirs on each end with 1 hole each. Can I do one straight pipe full siphon (with union & gate valve) & other side a durso emergency drain that 2 inch higher ?

 

[Jason_MrFrags]

Yes you could do it that way.

 

[Quietman]

Sure if designed right. Make sure the Durso is low enough to operate as a full siphon before flooding the tank. And you might want to tune it so that the Durso is operating as a trickle flow preventing the frequent tuning that herbie can require early on. I find my herbie requires much less tinkering with exact flow if I have a trickle in the emergency line. If you have room for a Durso - perfect, it's designed for low trickle flow and can shift into full siphon for protection. It'll be a Bean Animal without the backup emergency (which is fine imo).

Just make sure your return section of sump is sized so it can't overflow the tank even if no drains are operating. That's the backup for a herbie.

 

[OrlandoAIOReef]

Sure if designed right. Make sure the Durso is low enough to operate as a full siphon before flooding the tank. And you might want to tune it so that the Durso is operating as a trickle flow preventing the frequent tuning that herbie can require early on. I find my herbie requires much less tinkering with exact flow if I have a trickle in the emergency line. If you have room for a Durso - perfect, it's designed for low trickle flow and can shift into full siphon for protection. It'll be a Bean Animal without the backup emergency (which is fine imo).

Just make sure your return section of sump is sized so it can't overflow the tank even if no drains are operating. That's the backup for a herbie.

So it’s a must I get the 40B sump kit so only the water in return section goes up if both 1.5” drains clog, I’m using a 60B as a sump (same as 40 but 4ft)
How close is height difference Is your main drain vs emergency to accomplish that?
& dang my emergency durso is like 1/2” above the tank

 

[EeyoreIsMySpiritAnimal]

I thought about doing this once but realized that the overflow box with the emergency drain would end up essentially being stagnant...

 

[OrlandoAIOReef]

I thought about doing this once but realized that the overflow box with the emergency drain would end up essentially being stagnant...

Yaa I thought about this as well, was planning to use a small return pump from my IM 15gallon to shoot water out thru the weirs

 

[EeyoreIsMySpiritAnimal]

Yaa I thought about this as well, was planning to use a small return pump from my IM 15gallon to shoot water out thru the weirs

Why not just build the tank with one larger overflow box for everything?