Which overflow for 75G?

TheCureForSin · #1 12/17/2007, 05:31 PM

I'm running a 75 gallon and looking to do a 20g sump. I've been looking at the CPR C-Siphon Overflows. Now I'm wondering how many GPH I want. 600, 800, 1200, etc? I'm not really worried about the cost, but I don't want to go overboard or anything like that, just wondering what you folks think.

here's a link:
http://www.cpraquatic.com/products/overflows.html

rleechb · #2 12/17/2007, 05:35 PM

www.lifereef.com

Much better/safeer overflow

Tennsquire · #3 12/17/2007, 05:36 PM

CPR boxes are prone to overflow when restarted after a power loss. They also lose siphon over time. You're better off with a U-tube overflow. I have a Lifereef on my 75. I have an Amiracle on my prop system. They're much more reliable, and are designed to not lose siphon.

TheCureForSin · #4 12/17/2007, 05:48 PM

so I take it that 600 gph is good for a 75g? 2 people already praising the lifereef, definitely have that bookmarked. Ends up being about the same price as the CPR after the accessories anyways.

So you think just one 600 gph will work just fine?

nw2rfing · #5 12/17/2007, 05:53 PM

I have a cpr, and ive had 3 overflows on freshly re-done hardwood floors prior to moving my tank where it is now.... if you can afford or can get a tank with a built in system, I STRONGLY suggest you go that route... if you do get the CPR, invest in the lifter pump... I purchased that through Drfoster&smith... has stopped the overflowing, but if I dont check it weekly, an airbubble still gets trapped. I am now going to invest in a new tank cuz im fed up

TheCureForSin · #6 12/17/2007, 05:58 PM

Quote:

Originally posted by nw2rfing
I have a cpr, and ive had 3 overflows on freshly re-done hardwood floors prior to moving my tank where it is now.... if you can afford or can get a tank with a built in system, I STRONGLY suggest you go that route... if you do get the CPR, invest in the lifter pump... I purchased that through Drfoster&smith... has stopped the overflowing, but if I dont check it weekly, an airbubble still gets trapped. I am now going to invest in a new tank cuz im fed up

That's pretty rough. I rent and have already overflowed my tank once while filling (I don't want to talk about it hah). Don't think my landlord would like any more of that happening, not that I told him in the first place, but it's a thought.

I'm new to the whole sump/refugium setup. I've always just used basic filters, so lots of questions on this sort of thing.

kdblove_99 · #7 12/17/2007, 06:12 PM

I have used and highly recommedn the Lifereef as well. The neevr overflow or lose syphon even after a power outtage they will start right back up

TheCureForSin · #8 12/17/2007, 06:15 PM

now how do you guys feel about this:
1" male threaded output with connector
Optional AquaSilencer for $24.00
?

Looking to order asap, so...

rleechb · #9 12/17/2007, 06:19 PM

You can build a little stockman standpipe out of 1" pvc to save a little cash. However, I'd suggest you pick up a 3/4" U-tube instead of a 1" (lifereef'll provide pricing).

You need to push enough flow through the U-tube to keep bubbles from accumulating. With a 20g sump, you'll probably end up having to push too much flow through your sump ( which manifests as microbubbles through the return and decreased skimming efficiency).

I've had two lifereefs and no overflows in about 3 years.

kdblove_99 · #10 12/17/2007, 06:22 PM

The silencers defiently work. you can make one for probably under $5 my father in law did.

But if you dont wanna make one then for sure buy one, you wont regret it otherwise that overflow will be loud.

The adapter is good if you plan on using tubing.

I used PVC

TheCureForSin · #11 12/17/2007, 06:37 PM

Quote:

Originally posted by rleechb
You can build a little stockman standpipe out of 1" pvc to save a little cash. However, I'd suggest you pick up a 3/4" U-tube instead of a 1" (lifereef'll provide pricing).

You need to push enough flow through the U-tube to keep bubbles from accumulating. With a 20g sump, you'll probably end up having to push too much flow through your sump ( which manifests as microbubbles through the return and decreased skimming efficiency).

I've had two lifereefs and no overflows in about 3 years.

so instead of the standard 1" bulkhead I should run with 3/4" is what you're saying? I'm a little slow on this type of thing

rleechb · #12 12/17/2007, 06:48 PM

Nope. The 1" bulkhead is fine. That's for the hole at the bottom of the backside of the overflow (what takes your water to your sump).

The 3/4" is the U-tube itself. It's normally a 1" U-tube. For smaller sumps/tanks, it's better to run a smaller diameter u-tube. Larger diameter u-tubes end up having to require a higher rate of water going through them in order to keep bubbles from accumulating (ultimately becoming a siphon break). In all reality, you won't want to push 600-700 gph through a 20g sump, but closer to 200-250.

HTH.

Dwarf Seahorses · #13 12/17/2007, 06:51 PM

The only HOB overflow anyone should ever consider is LifeReef. Period.

TheCureForSin · #14 12/17/2007, 07:02 PM

this is what I was thinking about getting for my 20g sump:

http://cgi.ebay.com/MegaPro-Refugium...QQcmdZViewItem

The plumbing seems easy enough, but I'm wondering about a return pump and how I should approach that and if I want maybe a small powerhead for the sump too? anyone have ideas?

and it's a 20 long

kdblove_99 · #15 12/18/2007, 03:21 PM

That skimmer area looks very small and you wont be able to get a decent skimmer in that samll footprint..

A 75gallon you should be abole to get a bigger sump under the stand. Go as big as you can. I would find a used tank like a 40 gallon if it fits under you stand and silicone in your own baffles.

Lowes can cut the baffles for you or a glass shop