Calfo weir - quick question.

[Gaz_XB9R]

Firstly is it Calfo or Calflo?

Anyway, was wondering if anyone has any reasons why a sloped weir would not work in the tank?

To explain, instead of two pieces of acrylic / glass to form the Calfo, could we just use one piece angled from the back wall at around 30 degrees with the usual comb top.

To my mind it would certainly be more aesthetically pleasing when viewing from the front and would also save the big shadow under the box.

I will be having a 7' x 30" x 30" built in the near future. So want to get my design nailed down.

Cheers,

Gaz

 

[RocketEngineer]

Its Calfo. Anthony Calfo was the one promoting coast-to-coast overflows so his name got attached to them.

On a side note, you don't want a comb across the top if you are trying to maximize surface skimming. Use a cover just above the water to keep snails/fish out instead.

The main reason for the box shape is to have enough room for the drain elbows within the box. If you are going with an internal/external setup, an angled box is fine.

Check out d2mini's build in the Reef Discussion section. He has about the same size and went with an internal/external setup but his overflow doesn't go the full length so it is square but hidden mostly under the bracing.

Good luck,

 

[Eud]

Firstly is it Calfo or Calflo?

Anyway, was wondering if anyone has any reasons why a sloped weir would not work in the tank?

To explain, instead of two pieces of acrylic / glass to form the Calfo, could we just use one piece angled from the back wall at around 30 degrees with the usual comb top.

To my mind it would certainly be more aesthetically pleasing when viewing from the front and would also save the big shadow under the box.

I will be having a 7' x 30" x 30" built in the near future. So want to get my design nailed down.

Cheers,

Gaz

An internal box with an angle like an office door mailbox works ok if you are putting the plumbing in an external box. No teeth, though. Just edge. Put a lid on it so the slot is just bigger than the water height if you are worried that stuff will go over.

 

[Gaz_XB9R]

Thanks for that.

To be honest I'm surprised no one that is running an internal - external set up has gone with a sloped internal.

Any info on how covers are usually fitted to stop the inevitable jumpers?

Gaz

 

[RocketEngineer]

I know that in my case the internal box doesn't go the full width of the tank so having square ends on a square box was easier.

Most covers I've seen are simple acrylic affairs. There are "legs" that touch the top of the overflow box in certain spots and then vertical edges that can be shaved down to clear the water surface. Nothing fancy, just functional.