Thoughts on eductors

[Bullet]

I am getting a new return pump and it is more powerful than what I have now. With all the extra power I am thinking about installing these on the ends of my returns:

http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/9847

My thought is that I can add more flow inside my tank as well as the turnover at the same time. From what I know about these eductors you do lose some head pressure but with this new pump I should have enough power to run them...maybe even split the returns into 4 versus the 2 that I have now and basically add 4 powerhead to the tank.

Am I thinking correctly? What am I missing?

 

[mwood]

What pump are you getting?

 

[slovan]

You'll like the eductor/penductor Bob. :thumbsup: I have the FPT instead of MPT because it was easier to get parts for. If you get the female, all you need for each eductor/penductor is a loc-line male adapter and a loc-line double socket to connect to your loc-line segment.

It's a cheap way to add flow. I'm using a Sequence Tarpon pump on my 210 and it works great. I have tinkered around with the idea of adding an additional one or two for more directional flow but haven't got around to trying it.

 

[Covey]

Go ask the engineers in the DIY section. The eductors are generally not as cool as people think. The offer a big restrition to the return pump most of the 3/4" or 1" cut down to like 3/8". Flow pumps like the Dart versus a pressure pump with eductors the dart is still more effiecent. If you compare the prop pumps to a pressure pump it is not even close.

GPH per Watt there are a alot better options.

 

[slovan]

<a href=showthread.php?s=&postid=8906486#post8906486 target=_blank>Originally posted</a> by Covey
If you compare the prop pumps to a pressure pump it is not even close.

GPH per Watt there are a alot better options.

I can't argue with that. But prop pumps aren't going to return water from the basement either. Might as well make the most of the return since he's got to have one.

 

[Covey]

I've always been a fan of the low sump turnover, high intank turnover system.

Like 80% of my return goes thru my skimmer before it even gets to the sump.

 

[Covey]

<a href=showthread.php?s=&postid=8905705#post8905705 target=_blank>Originally posted</a> by mwood
What pump are you getting?

Thats a real good question too because if its not a pressure rateed pump the eductors really are not a good idea.

 

[bgreenlee]

<a href=showthread.php?s=&postid=8906609#post8906609 target=_blank>Originally posted</a> by Covey
I've always been a fan of the low sump turnover, high intank turnover system.

Like 80% of my return goes thru my skimmer before it even gets to the sump.

What are you running through your sump now Covey?

 

[Covey]

Coralife 1090GPH thru a SCWD with 4.5" of head. Most of the water runs thru the gravity feed on the skimmer. I've never bucket tested to get the exact GPH what ever is left runs thru the second overflow.

 

[matt the fiddler]

bob, I have a eductor that is not hooked up, but possibly will be in the near future, [if I don't you are more than welcome to borrow it to test it out for a bit] I really like the flow they put out! I have used it both on a panworld 50px and a panworld 150 [the 150 is on my skimmer now]

once you calculate headloss, if you can get gph and etc. I am looking for a chart [if i can find it in bookmarks] of a rough flow of what it will put out. You will be better to use the eductor than to throttle the return back...

I liek the flow pattern they put out as much as the amoutn of flow..


HOWEVER. Paul, the owner of oceansmotions has a special nozzle he has devolped to distribute the flow.. In talking with him he does not like eductors, but thinks there are other options [other than pressure] to multiply flow]
he has not released this nozzle yet.... i can't remember where his pics of it are buried

 

[matt the fiddler]

Bingo

ignore the gears there...

http://www.oceansmotions.com/bb.htm

5th one down..

 

[dascharisma]

<a href=showthread.php?s=&postid=8906609#post8906609 target=_blank>Originally posted</a> by Covey
I've always been a fan of the low sump turnover, high intank turnover system.

I agree 100%. Since the return pump is probably the most ineffecient pump in the system, there are certainly better ways to acheive turnover in the display. Also, If your primary means of nutrient export is a skimmer, then bringing the water to the sump faster than the skimmer can use the water isn't helping filtration.

That being said, fewer pumps in the tank is very visually appealing.

Brad

 

[Bullet]

Hey guys...Thanks for you thoughts....To answer a few questions...I am getting a Blueline 100 or something like that. I also agree with less tank turnover is better and that is why I am thinking about restiricting this pump on the output end with more head pressure vs. closer to the pump. Plus I am getting more flow. As far as the looks go....I need returns anyway.

 

[bgreenlee]

Are you setting the new pump up as closed loop only?

 

[Bullet]

No. it will be my retun pump from the basement.

This is the pump I am getting:

http://www.championlighting.com/product.php?productid=18059&cat=485&page=1

 

[mwood]

Just plumbing that will bring your flow down to around 1500gph. Don't remember, but I think the eductors will reduce flow to 800-1000 gph. You'd have just enough flow for 1 3/4" eductor using 1" pvc till you get there.

Just a thought, have you considered a OM SS? Would be a better use of the pump in my opinion.

 

[Bullet]

Does anyone know how much flow these all glass mega flow overflo's can handle?

 

[mwood]

What are the drain pipe sizes? There's a calculator on the homepage.

 

[slovan]

Each overflow should be able to handle 600 gph since it has 1" drains.

If you need your overflow to handle more or need protection from flooding, you could turn the 3/4" return in the overflow into another drain set a little higher than the 1" for added protection. Just run a separate line over the back of the tank for your return.

 

[matt the fiddler]

that is once nice pump.

rather than putting the 3/4 up high where it is inefficient... I set the 3/4 inch at the bottom of the overflow, and the 1" at the top- that way I am maxing out the 3/4 inch with the pressure of the water above it [probably 5-700 gph though a 3/4 drain at 10 inches deep] and still get the quietness my durso has on my 1" up high. I ran a mag 12 unrestricted up 5 feet and the 3/4 inch handeled nearly 90% of the flow when it got to the top of the 1" drain, if that makes sense....