Anyone using eductors on return pumps?

[Myka]

Actually, the Poseidon line operates up to 50 PSI. The PS3 max head is 26'. The Poseidon PS3 is comparable to the Iwaki 55RLT although this Iwaki is also 26' max head and 1100 gph at 0' head it is only rated up to 17 PSI. Plus the Iwaki 55RLT uses 190 watts where the Poseidon uses 140 watts.

If I don't use the eductors and the OM there is no point in reducing the return opening because it wouldn't increase the flow enough to be usable. That's what I'm worried about with the eductors...will it be enough to be noticeable? Will the eductors increase the return flow enough that the flow will hit the bottom of the tank and thus be useable to help keep detritus suspended at the rear of the tank? I don't normally look at the return as a source of usable flow, to me it's job is to operate the sump and bring flow to the skimmer. I'm simply trying to justify using the OM and the second return hole in the tank.

[Skimmerking]

Mindy the eductors are like what I have stated . If you have a 1" return line and you go to a 1/4" at the end its going to have the same effect as one of those. if you crimb the ends somewhat or use loc line then you can get the same effect. its not going to take much to push flow in a 48" tank.. just sayin or I suspect that you should just close it up and use one opening

[Myka]

Originally Posted by Skimmer King

mindy thge eductors are like what i have stated if you have a 1" return line and you go to a 1/4" at the end its going to have the same effect as one of those. if you crimbthe ends somewhat or use loc line then you can get the same effect. its not going to take much to push flow in a 48" tank.. just sayin

That isn't the same effect. Reducing the line increases velocity, not volume. The eductors increase volume. I want to hit the bottom of the tank, not go across the length.

http://www.advancedaquarist.com/2003/9/review

[Reef Pilot]

Originally Posted by Myka

That isn't the same effect. Reducing the line increases velocity, not volume. The eductors increase volume. I want to hit the bottom of the tank, not go across the length.

If you are just trying to stir up the bottom to suspend detritus, not sure this is the best way. The flow will be concentrated in one spot, which will be very clean, but the detritus will just be moved to somewhere else in your tank.

I also have the Coralife DC 5800's, one on each side of a 6 ft tank. I set them to turbulence mode which varies where the flow meets to blast the bottom and doesn't let detritus build up in one area. I think all the wave maker type pumps, like ecotech and tunze, work that way.

[Myka]

Originally Posted by Reef Pilot

If you are just trying to stir up the bottom to suspend detritus, not sure this is the best way. The flow will be concentrated in one spot, which will be very clean, but the detritus will just be moved to somewhere else in your tank.

I also have the Coralife DC 5800's, one on each side of a 6 ft tank. I set them to turbulence mode which varies where the flow meets to blast the bottom and doesn't let detritus build up in one area. I think all the wave maker type pumps, like ecotech and tunze, work that way.

Well, I do have the three Tunze pumps on a controller as well. I run the 6055 behind the rocks in my 90 and it works well to keep detritus from settling behind the rocks. I do have one spot in my 90 that I can't seem to get the detritus out, so I just siphon it out. Both the tanks are bare bottom.

Honestly, I'm really just looking to justify the use of the 2-way that's collecting dust. I don't want a closed loop and there is no point in using the 2-way on a 660 gph return line, buuuut if the line has an eductor on it increasing the flow to 1800 gph then perhaps it could be useable.

[Reef Pilot]

Originally Posted by Myka

I do have one spot in my 90 that I can't seem to get the detritus out, so I just siphon it out. Both the tanks are bare bottom.

Well it could work for that, if your Tunze's keep the rest of the tank bottom clean. Give it a try, and see what happens.

[Myka]

Originally Posted by Reef Pilot

Well it could work for that, if your Tunze's keep the rest of the tank bottom clean. Give it a try, and see what happens.

This plan is for the new tank. The rock will be designed much different...if I manage to have the patience to make it the way I want to.

[sphelps]

I seem to recall eductors needing around 20psi @ 500GPH to be effective so since you may be in the ball park it makes sense to try them out considering they are an inexpensive addition. However I also seem to recall that OM units are not designed to work with eductors so perhaps an email (or phone 1-877-812-4108) to Paul from OM would be a good idea.

[Myka]

Originally Posted by sphelps

I seem to recall eductors needing around 20psi @ 500GPH to be effective so since you may be in the ball park it makes sense to try them out considering they are an inexpensive addition. However I also seem to recall that OM units are not designed to work with eductors so perhaps an email (or phone 1-877-812-4108) to Paul from OM would be a good idea.

Yes, I have read this mentioned a couple times as well, but can't find any specific information. I'm not sure why it would affect an OM. I will look into it.

EDIT: Just found this...the back pressure from the eductors can put pressure on the drum of the OM and although it doesn't cause damage, it will prevent the drum from turning. There seems to be a way around this... keep posted.

http://archive.reefcentral.com/forum...d.php?t=578481