Planning on making a Weir

[Toothpik]

Hi, Im planning on making a weir for my 10gallon tank to give water to my sump(also a 10 gallon but its still in progress) but im wondering if i give it a U shape chamber how do i make the water go over the wall of the inner chamber that is actually inside the tank. Im very confused help is much appreciated

 

[ccCapt]

I'm sure you can make one if your good with acrylic, but it might be better just to buy one.
Eshopps Overflow Boxes

 

[Toothpik]

but the thing is it didnt answer my question about how to make the water go over the wall and into the pipe down into the sump

 

[neilanh]

Typically a sipon tube is used to move the water from the internal box to the external box, where it can then be gravity fed to a sump below.

 

[cmor1701d]

Check out this DIY article on melevsreef.com

 

[fijiwigi]

but the thing is it didnt answer my question about how to make the water go over the wall and into the pipe down into the sump

Its kinda like siphoning gas from a car. take your hose and start sucking to get the air out being carefull not to get gas in your mouth. With the overflow u-tube you stick airline tubing in it and suck the air out being carefull not to get saltwater in your mouth, However it does taste better than gasoline still unpleasent. LOL