what HOB overflow should I get

[Pontius]

I need a hob overflow for a 135 gallon. the sump pump is rated at 1070 gph. I previously had this wet/dry and pump on a 72 gallon with the overflow rated at 600 gph, so should I get 600 gph in the hob overflow? also, is there a particular brand that is better than others? thanks for the info.

[lunner]

I got a Lifereef's

Link~~~ (http://www.lifereef.com/frame.html)

[sjm817]

If you are using a 1000+ GPH pump, you cant use a 600 GPH overflow.

The best overflow available is Lifereef (http://www.lifereef.com/siphon.html). With a big pump like that, you would want the double 1400 GPH model.

[Avi]

I've often heard that Lifefeef are good. But I do have more than two years of exerience using two Amiracles and I can say that they have been thoroughly trouble-free. I would recommend that on a 135-gallon tank, that no matter which you decide to get, that you use two, rather than one, though.

[Alaskan Reefer]

Lifereef and Amiracle are the standards, and this isn't a good place to skimp...

[cateyes]

<a href=showthread.php?s=&postid=6821998#post6821998 target=_blank>Originally posted</a> by Avi
[B I would recommend that on a 135-gallon tank, that no matter which you decide to get, that you use two, rather than one, though. [/B]

on a 75 would you say 2 singles, one in each corner, would be a good way to go.. or is that overdoing it???

[Avi]

I think that two is better than one in general. Most of the time in smaller tanks only one is used but on a 75-gallon tank, two would definitely be my preference. Just make sure you get the right pump for the two.

[okiejaco]

How are these overflows as far as noise is conserned? What about using for a low flow set up? I have a 120 that I want to use as a saltwater but don`t really want to drill it and take the chance of it cracking. I was planning on about 200 gph through the sump.

[sjm817]

I also like and have used Amiracles, but do not recommend them for high flow applications (not that I like high flow return pumps, but that is another subject). 2 Amiracles would not keep up with 1000 GPH.

[Pontius]

so 2 overflows at around 600-700 gph each instead of 1 at 1400 gph? would you recommend ball valves on the overflow pipes and return pump pipe?

[sjm817]

2 overflows that will actually flow 600 700 GPH would work. 2 that are rated for that but wont actually flow that much would not work.

What pump are you using?

[Pontius]

the pump is a Surge 7500, rated at 1070 gph. it was used on a 72 gallon All-Glass Aquarium that overflow was rated at 600 gph, and there were never any problems.

[Dubbin1]

<a href=showthread.php?s=&postid=6823577#post6823577 target=_blank>Originally posted</a> by cateyes
on a 75 would you say 2 singles, one in each corner, would be a good way to go.. or is that overdoing it???

I would say that it is a bad idea. One good overflow will be plenty.

[sjm817]

Something doesn't add up. How did a 600 GPH overflow handle a 1000 GPH pump? You must have had some serious head loss. The flow would have had to be cut at least in half.

Edit. I did a Google search on it. Looks like a pretty low end pump. It probably flows considerably less than the 1070 GPH rating especially with some head loss.

[Avi]

Pontius...you might want to play around with this to get a good idea of what pump you'd want to use on the overflow(s) in your configuration:

http://www.reefcentral.com/calc/hlc2.php

okiejaco....as far as noise is concerned...I don't believe there's any way to tell in advance whether any overflow might be noisy until you set it up because every configuration, with its individual configuration, is different. But, even if it does make noise...a lot of noise...that's an easy fix with a Stockman overflow or other simple and easy to construct device.