penductors from AquariumSpecialty.com

[PhLipStyLz]

I've skimmed through a couple of threads about penductors and still dont have a firm grasp of how they work. Also, what is the difference between a penductor and an eductor (in laments terms please, no hydrology talk)?

I was about to buy a retro fit lighting kit from aquariumspecialty.com and came across these on their homepage:
http://www.aquariumspecialty.com/catalog/product_info.php?products_id=137

then i started my reserach... and im still a little clueless....

would this be beneficial if i connected it to the end of my return line (58 gal RR oceanic tank)
i'm only using a mag 7 for the return, would that be enough pressure at the outlet of the penductor to make it work efficiently? (mag 7 is rated at 500 gph at the head level i'll be at)

i also have the option of connecting it to the end of my sea swirl which i thought would be pretty cool... right now im pushing 500 gph through my 1/2" SW... if i throw this penductor on the end, will there be better flow patterns?

any help would be greatly appreciated


thanks in advanced to everyone

 

[miracles38]

I would love to know this info also. I have never been able to figure out how they work.

 

[CaliforniaDreamer]

I believe that a penductor is just a specialized version of an eductor. I think penductors are designed for fluid mixing but work well for tank flow also. I think the plume dispersion angle is somewhat larger for a penductor which means that the output of the pneductor is more dispersed.

As to how they work, I think that it just uses the Bernoulli principle. In other words they use the energy of the incoming water to push additional water out with a resulting increase in quantity and a corresponding decrease in pressure (or speed of the outflow).

As far as using them in an aquarium the primary problem is their size, especially in a small tank. They also require a pressure rated pump; if the output isn’t sufficiently strong they don’t produce much additional flow. I have eductors in my Koi pond and they work well. However they are much too large to use in any of my aquariums (they are about 10 inches long).