Backyard Aquaponics
A place to discuss aquaponics

Haha - you are right on the ball Mr Smooth Moderator!

No special pump is required, KrisGee. In fact, the literature suggests one can use a smaller, less powerful pump due to the significant increase in overall water movement achieved with the attachment of an eductor. As DrLuke astutely suggested, however, there seems to be a small loss of flow as a tradeoff to increasing the total volume moved.

That does seem to be a little too good to be true, where's the info from?

KrisGee if used to pump water they are more commonly called Jet Pumps.

I think the title should be called:
Myth or Fact: DO Depletion by Pumps, Use of Eductors, Arguments on Thread Titles, Pros and Cons of Thread Splitting

Couldn't you work "pizza" and "beer" somewhere into that title ? I'm disappointed.

From what I gather with a brief bit of reading, and I certainly aint no expert, but you have to have increased pressure through the nozzle to produce the increased flow. I don;t know that this really works out as increased efficiency at the end of the day does it? A little like the early debates we had on here about the efficiency of venturis, and the fact that restricting the pipe to create higher flow rate in a venturi to enable the effect means that the pump is working more. When in fact a lower wattage pump, pumping water over a low cascading waterfall adds more aeration for less power, but isn't as fancy or as fun.

If the aim is purely to move water around a tank, there are those small submerged pumps with open impellers that are incredibly efficient at moving large amounts of water.

Am I the only one who keeps reading Educators and not Eductors...

Yep


Yeah, that's along the lines I was thinking. I have four venturis on my system and they're all gravity fed - I don't see how I can improve on that without consuming more power (and maybe not even then).

for some reason I was reading Reductors

Myth or Fact: DO Depletion by Pumps, Use of Eductors, Arguments on Thread Titles, Pros and Cons of Thread Splitting, Difficulties of Reading Long Thread Titles While Drinking Beer and Eating Pizza, Especially when one of the words sounds like a Synonym of Teacher.

Why do we need to add venturi's, teachers, pizzas, over engineering etc when what we have is simple and works?

I am just about to enjoy some pizza myself!

On the serious side, if it can improve things, we should not dismiss it just yet. A lot of people don't want or need an auto feeder, but there is a thread dedicated to it.

I wasn't actually referring to the converging diverging nozzle that forms the main Venturi.

Check out he Wikipedia diagram and ull see what I mean http://en.m.wikipedia.org/wiki/Eductor-jet_pump





*added diagram - charlie*

Gotta eat something while we're waiting for the fish to grow !


Yep, good point RM. I don't think it's getting dismissed at this point, just the value of it being questioned - I think that's healthy.

I for one would very much like to see a video of one working.