eductors/penductors @ MO

[Gary Majchrzak]

Just a heads up: I spotted penductors for sale at Marine Oasis for a very reasonable price.

 

[acdraindrps]

I was going to start a thread about penductors/eductors. I read about them briefly, but could not grasp the concept behind them. Can someone please explain to me how they work?

 

[Henry Colf]

As liquid is pumped through the center cone a vacuum or vortex is created in the surrounding cone and water is pulled into the surrounding cone mixing with the water that is being pumped through the center.So lets say if you are pumping 5 gal a min. through the center cone another 4 gal a min. is being pulled into the outer cone now you have 9 gal. a min. pumping through the mixing eductor.Hope this helps.(my terminology may not be correct but the process is)

 

[captain7359]

gary are they the same short style you have? any idea what mfg they are from.
Thanks,
Walter

 

[thriceanangel]

This Might help

 

[Gary Majchrzak]

more info on penductors:

http://www.kthsales.com/website/Misc/hello_salt_water_enthusiasts.htm

Walt- I think my penductors are a different size than what John has. My returns are larger.

 

[Henry Colf]

I think the ones John has right now are the 3/8" he has the 3/4" coming in next month.The 3/4" ones are back ordered.

 

[RCBrooke]

I'm runnimg 4 - 1/2" penductors (loc-line) / one pump. A little trouble keeping the sand from moving. Depending on how I adjust the penductors I get bare spots in front / back / or on the sides. I've come to the conclusion that you don't need as big a pump as the specs seen to indicate. I've had to valve back to 1/4 on the return line just to keep from over powering my 1" drains.

P.S. Watch out for spray when doing a water change, I have 3 of the 4 penductors pointing towards the water surface and when I kicked the pump on water shot out of the penductors and beyond the tank by about 4'.

Randy

 

[Gary Majchrzak]

Penductors will actually decrease the amount of water going down your drains while increasing the amount of water being circulated in your aquarium. This isn't an easy concept to grasp and at first it had me fooled.
Penductors divert some of the pumping pressure generated by a pump in order to mix returning water with water already in the aquarium.
By adding penductors in my aquarium I decreased the amount of water passing through my drains and sump while increasing the amount of water circulating in my aquarium.
If your pump is overpowering your drains, penductors might be an excellent choice for increasing in-tank circulation while allowing you to stop restricting your pumps output.

 

[RCBrooke]

I'm runnng 4 penductors (from BlueZoo 1/2" loc-line). I think I need to reduce my pump. I bought a Sequence UNO Marlin max head 37'. I figured 23 feet of head for the penductors (I got that from some spec sheet) plus 5' tank to floor plus 5' floor to sump. Total of 33' of head is what I figured. The chart for the marlin gves a flow of 600 gph at 33'.

Looking back at the info it looks like it's 10 psi plus for a penductor. I'm not sure how I converted from psi to feet of head.

Long story short, I've got 'plenty' of flow at 1/4 open return valve.

Randy

 

[der_wille_zur_macht]

Bringing this back from the dead. Interested in hearing what people are using these days. Specifically:

1) Brand and size
2) Your method for matching size and count to your pump
3) Anecdotal results

KTH has published their flow charts for their products, but there are a ton of cheap imported brands making these devices now, and I can't find any hard info on them as far as size/pressure/flow capacity. I am thinking about putting them on the closed loop in my tank but don't want to just guess blindly.

 

[Gary Majchrzak]

I can't remember what I'm running...

I can't remember what I'm running...

it's been so long..

I used somebody's recommendations but I'll need to search that up, too.
Anecdotal observations? I wouldn't say they're anecdotal. Penductors / eductors work as advertised. I don't know how they'd perform on a CL, though.

 

[captain7359]

They work good on a pressure pump, but defeat the benefits of a high flow/low pressure pump(aka Dart). If you don't want to run big piping all around for your dart style pump then a pressure biased pump and some eductors get you good flow with smaller piping. KTH was pretty good about matching up a pump based on it's curve to how many eductors of certain sizes you would need. I've got a 3/8" or 1/2" orifice one on my 40 breeder frag tank and the change in flow is pretty dramatic with the eductor installed. I run a mid-range reeflo uno series pump to feed the breeder, ozone reactor, and supply to my 180 display upstairs.

 

[Gary Majchrzak]

yes!

yes!

of course Walter is right. These penductor things work best with pressure rated pumps.