Overflow - Teeth or Not

[d2mini]

My 7ft toothless C2C overflow skims like mad! Love it.

Hate toothed overflows. Always getting algae and stuff in there. Looks like me after I eat a spinach salad.

 

[BigAl2007]

My 7ft toothless C2C overflow skims like mad! Love it.

Hate toothed overflows. Always getting algae and stuff in there. Looks like me after I eat a spinach salad.

LOL ! Dennis that was too funny!!

I've had TOOTHED for years and can tell you for sure NO MORE TEETH for me!! Smooth all the way! Been there done that toothed thing and I'm done!!

 

[super_steve85]

As far as the noise goes, isn't it more a function of how far the water falls inside your overflow box? The level in my overflow is about an inch lower than the tank which keeps things pretty quiet. I suppose if the water level is considerably lower you would get the sound of a bunch of small weirs pouring in instead of a single large one....

 

[kcress]

As far as the noise goes, isn't it more a function of how far the water falls inside your overflow box? The level in my overflow is about an inch lower than the tank which keeps things pretty quiet. I suppose if the water level is considerably lower you would get the sound of a bunch of small weirs pouring in instead of a single large one....

Partially. But with teeth you get more of a peeing action which causes the water to separate from the weir and land out in the overflo box instead of sliding down the wall. You can certainly have the same issue with a smooth weir but you need about twice the flow per in before you have that happening with a smooth one.

But to me the biggest advantage is that it's easier to modify and to hit your target first time with a smooth weir. I've often been tortured by toothed weirs causing so much restriction that the tank level was shockingly higher than expected.

 

[vietnam]

I prefer toothless, but in my tank it did do the job and keep the fish as well as snails out.

 

[sammy77]

Wouldn't a screen work better than the egg crate to keep the lil critters out in the overflow area?

 

[super_steve85]

Weir flow

Weir flow

But to me the biggest advantage is that it's easier to modify and to hit your target first time with a smooth weir. I've often been tortured by toothed weirs causing so much restriction that the tank level was shockingly higher than expected.

I've got a civil engineering reference manual that I used when studying for the PE exam. It's got some helpful formulas for figuring flow through a weir. I used it when building my tank and the formulas worked out to be pretty close to real world. I love it when that happens.

If you ever need them just holler at me.

 

[shovelrider]

If you run no teeth you just need to use gutter guard to keep the animals out.

 

[robertifly]

Toothless and love it. Toothless will skim more surface than other, toothless tends to be quieter. I made a simple creature guard of black nylon gutter guard by bowing it up long ways and inserting it down into my black acrylic weir, it disappears and stop migration into drains of any but the smallest animals which teeth couldn't keep out either.

 

[kcress]

I've got a civil engineering reference manual that I used when studying for the PE exam. It's got some helpful formulas for figuring flow through a weir. I used it when building my tank and the formulas worked out to be pretty close to real world. I love it when that happens.

If you ever need them just holler at me.

Hi SSteve!

Those weir numbers were for smooth weirs though, weren't they?

You a CE or a ME?

Thanks much for the reference offer.

 

[super_steve85]

Hi SSteve!

Those weir numbers were for smooth weirs though, weren't they?

You a CE or a ME?

Thanks much for the reference offer.

I'll have to double check.

I'm a CE but practice structural. All the weir/pipe flow stuff I had to learn was by force. :lol2:

 

[reefermad619]

I like em like I like my women... Toothless.

 

[BeanAnimal]

I posted a formula a few times here in a few threads... never added it my site and not at the office to look it up.. happy searching

 

[super_steve85]

I believe the toothed overflow falls into the contracted weir type and the toothless is suppressed.

 

[keihi20]

robertifly:

Can you explain a bit more about the gutter guard?

 

[greaps]

Anyone else, yeah this was dug up. Strongly considering going toothless after reading this thread.

 

[johnfallon135]

i'm digging this up again too lol! why is everything in stores done with tooth then?

 

[krazyk148]

I did drill holes. Had to find a way to keep an octopus from getting into the overflow!

 

[IdahoCindy]

Toothless. One of the best decisions I made in my build.

 

[03LightningSVT]

http://reefcentral.com/forums/showthread.php?t=2478221