Looking for Good DIY Hang On Overflow

[maginter]

Hi All -

I need a good DIY for a hang on over flow to support a 55 gallon tank. I would like to have somthing that can support as much as 900 gph. I have a 20 gallon sump, the 55 gallon is not RR and cant be drilled.

All help is appreciated.

Mark

 

[danferd2002]

http://www.melevsreef.com/acrylics/overflow.html

 

[Jester75]

Try Melev's , he has some awesome plans there!

 

[Jester75]

Lol
:rollface:

 

[danferd2002]

lol jynx

 

[sjm817]

I would not build a CPR clone.

 

[maginter]

<a href=showthread.php?s=&postid=8477112#post8477112 target=_blank>Originally posted</a> by sjm817
I would not build a CPR clone.

And a CPR is????

 

[maginter]

<a href=showthread.php?s=&postid=8477030#post8477030 target=_blank>Originally posted</a> by danferd2002
http://www.melevsreef.com/acrylics/overflow.html

Thanks...This will help a lot

 

[RandyStacyE]

I’ve never attempted working with acrylic so I made an overflow out of PVC/ABS:
http://randystacye.com/diy_overflow.htm

If I were ever to make an acrylic overflow I would copy this one:
http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/4982

If you were to make or use a similar overflow I would definitely use a Durso Standpipe with it.

 

[maginter]

<a href=showthread.php?s=&postid=8477665#post8477665 target=_blank>Originally posted</a> by RandyStacyE
I’ve never attempted working with acrylic so I made an overflow out of PVC/ABS:
http://randystacye.com/diy_overflow.htm

If I were ever to make an acrylic overflow I would copy this one:
http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/4982

If you were to make or use a similar overflow I would definitely use a Durso Standpipe with it.

The PCV one is a pretty cool idea....Thanks

 

[sjm817]

<a href=showthread.php?s=&postid=8477502#post8477502 target=_blank>Originally posted</a> by maginter
And a CPR is????

A very unreliable design that does not use a U Tube. It uses an integrated C channel. Air accumulates and you need an air fitting and a vacuum pump to constantly pull out the air. A U Tube overflow does not have this problem.

 

[maginter]

<a href=showthread.php?s=&postid=8477830#post8477830 target=_blank>Originally posted</a> by sjm817
A very unreliable design that does not use a U Tube. It uses an integrated C channel. Air accumulates and you need an air fitting and a vacuum pump to constantly pull out the air. A U Tube overflow does not have this problem.

Thanks

 

[jeffgp]

i have the 1400 gph over flow from aquatraders and just hook up a power head to the air line to suck out the air bubbles . it works for me

 

[maginter]

I am just looking for a short term fix to use a sump until we get a 180 up and running. Something low cost and effective.

All the input has been great!

 

[D Ro Supafly]

<a href=showthread.php?s=&postid=8477830#post8477830 target=_blank>Originally posted</a> by sjm817
A very unreliable design that does not use a U Tube. It uses an integrated C channel. Air accumulates and you need an air fitting and a vacuum pump to constantly pull out the air. A U Tube overflow does not have this problem.

This is pretty easy to work around without a vacuum pump.

Attach the airline to one of the outputs from a gang valve and attach another piece of tubing to the input for the gang valve. Start the siphon by sucking air through the line attached to the gang valve input. Once you've got the siphon started, close the valve on the output.

The tiny air pocket left in the overflow will never grow unless the siphon is broken by either moving the overflow box (draining the water) or opening the valve.

 

[Reefbox]

I've built, operated and experimented with many Overflow boxes throughout the years and this design is what I've found to be the most reliable and best permormer out of any that I've experimented with.

 

[sjm817]

<a href=showthread.php?s=&postid=8478777#post8478777 target=_blank>Originally posted</a> by D Ro Supafly
This is pretty easy to work around without a vacuum pump.

Attach the airline to one of the outputs from a gang valve and attach another piece of tubing to the input for the gang valve. Start the siphon by sucking air through the line attached to the gang valve input. Once you've got the siphon started, close the valve on the output.

The tiny air pocket left in the overflow will never grow unless the siphon is broken by either moving the overflow box (draining the water) or opening the valve.

The C channel overflows need the vacuum running all of the time, not just to start it. They will build up air from the water moving over the weir until there is enough to break the siphon. Then you have a big problem. A U Tube overflow has faster velocity and the bubbles are carried right through. No airline/vaccum needed.

 

[D Ro Supafly]

Have you ever tried it? Do you have direct experience with what I've described?

I have direct experience and it works.

My overflow pulls roughly 1200 GPH using this setup without accumulating air bubbles or losing the siphon.

Give it a try.

 

[sjm817]

No. Never tried a gang valve. How does it work? Maybe I misunderstood your post. Does it have a constant suction of some sort to constantly pull out the air accumulation?

My point is an overflow that needs external help such as a vacuum pump or other method of air evacuation is not a reliable design.

 

[D Ro Supafly]

It works because it eliminates the leak that most people have when they "pinch off" the siphon line (as the directions tell them to do in order to close the line). It doesn't need a constant source of evacuation once the siphon is started, it just needs to stay air tight.