need info on overflow box

[ANCHIENT MARINER]

Devious i know i had asked this Question already of you but i forgot what you said, sorry phil my Question is again i have a mag 7 for my return from the sump and since i do not have a RR tank what rate should the overflow box be this answer will be well apreciated since i can come back to read in case i forget :thrash:

 

[nycmat]

1" drain is approximately 600 gph. after that i am not sure.

 

[vanceny]

I would oversize in case you decide on a larger pump in the future. I think the flow drastically increases with drain size.
1.5" (inner diameter) = 1300 gph.

There a calculator over at rc:
http://www.reefcentral.com/calc/drain.php

 

[ANCHIENT MARINER]

also what type of overflow box would you recommend

 

[vanceny]

I've only done a diy version, so maybe someone else can chime in. I think the 2 types of overflows are the ones with the U tube and the other is the weir type. Not sure which is better.

 

[scarf_ace1981]

this info was given to me when i had some plumbing questions w/ my 120. instead of using the durso standpipe i just attached flex pvc to the bulkheads and it's quiet as can be.

http://www.barraquatic.com/overflows.php

they give you the overflow dimensions and gph rate. i did two 1" drains and asked scott @ aquarium specialty to make me a overflow box 10LX5WX6H

 

[MO~IDOL]

I've used Mag 7 with the CPR CS90 overflow box with out any problem

http://www.marinedepot.com/md_viewItem.asp?idproduct=CR1513

 

[rfc]

Hi,

I'm using a lifereef overflow box also with a mag 7 return on my 29g. Thus far I have never lost syphon. http://lifereef.com/frame.html

Regards

RFC

 

[scarf_ace1981]

oops i guess i didn't read correctly. i've used a mag 9.5 and a mag 5 w/ this overflow i purchased on ebay(aqualine)600gph, never clogged:

 

[Harif87]

CPR makes great overflows, right now im using a CS50 with my Mag 3, but for your mag 7 a CS90 sounds good.

 

[deelucky]

cpr with aqualifter.i have installed one on my folks 125gal and i fell in love with it.i have the standard u-tube and its alot louder and if the siphon breaks well lets just say im soon working on my 90gal RR.before i find out what it will be like.but if i wasnt upgrading i would get the cpr.

 

[nyumpa]

im using the lifereef with a mag 7 on 25g with 15 sump
the owner claim in 20years it has never failed after a power lose.
i have had a few and tend to believe him. i pull the plug a few times a week for feeding or main. never a problem when i plug the mag 7 back in.
with the cpr you need an air to maintain flow
most people that buy the lifereef had the cpr with water on the floor

 

[autoponicz]

i had a diy overflow box with 1" drain....and was using a mag5 for return....if your using a mag 7..a 600gph overflow would be enough because 700 gph plus about 4-5 feet head height would drop the flow to maybe about 400-500 gph(just a guess)...the mag drive pumps usually has a chart that you can compare the gph to the amount of feets you are pumping .....