Eductors?

[iVgOnMaD]

Here are the parts and any associated numbers:

*Item numbers are from Lowes in Eastlake area, not sure if they will be the same anywhere else, model numbers should works at any store. I got everything for about $5.

1x 1 1/2" REDUCER COUPLING
- 1 1/2" INLET
- 1 1/4" OUTLET
- SLIP JOINT
- MANUFACTURER: DURACRAFT PLASTICS
- MODEL: 28WK
- ITEM*: 25017

1x 1 1/2" FEMALE ADAPTER ABS-DWV
- MODEL: C5803
- ITEM*: 22765

1x 1 1/2" COUPLING ABS-DWV
- MODEL: C5801
- ITEM*: 22797

1x 1 1/2" X 3/4" BUSHING SPIGOT X FIPT
- MANUFACTURER: LASCO SCH 40
- MODEL: 438210RMC
- ITEM*: 22715

1x 1/2" BARB X 3/4" MALE THREAD NPT RISER FLEX ADAPTER
- MANUFACTURER: ORBIT Water Master
- MODEL: 37161
- ITEM*: 194541

1x 1" length of 1 1/2" ABS PVC (black) per Eductor.

[iVgOnMaD]

Instructions
Use these pics as reference (note: in this pic I have a 3/4" Slip x 3/4" FIPT adapter that connects the Eductor to my 3/4" return line, you need to id what adapter YOU need for your setup)




TOOLS:

Small Hack Saw for PVC
Hand Drill
7/16 Drill Bit
1/2" Drill Bit



Step 1

Take your 1 1/2" X 3/4" BUSHING SPIGOT X FIPT and cut it so it fits flush in the 1 1/2" COUPLING.



You take the 1/2" BARB X 3/4" MALE THREAD NPT RISER FLEX ADAPTER and cut off the barb leaving only about 1/4" of it.



You take the 1/2" BARB X 3/4" MALE THREAD NPT RISER FLEX ADAPTER and attach it to the 1 1/2" X 3/4" BUSHING SPIGOT X FIPT adapter with the barb side going in first. Tighten the 1/2" Barb Adapter by hand until you can not tighten it anymore.



If this step is done correctly you should have about 1/2" of the 3/4" male thread from the 1/2" barb adapter sticking out of the 3/4" threaded side of the 1 1/2" X 3/4" BUSHING SPIGOT X FIPT adapter.

Now take a 7/16" Drill bit and enlarge the hole of the 1/2" BARB X 3/4" MALE THREAD NPT RISER FLEX ADAPTER to this size.


Step 2

Take the 1 1/2" COUPLING and attach the configuration made in Step 1 to one of the sides with PVC Glue.

Drill 8 x 1/2" evenly distributed holes 1/2" away from the lip on the opposite side of the 1 1/2" COUPLING.




Step 3

Take the 1 1/2" FEMALE ADAPTER and attach a 1" length of 1 1/2" ABS PVC to the non-threaded side and glue it together. You must make sure the PVC pipe is pushed in all the way so you only have 1/4" of PVC piping sticking out after you put it together, if its too long, cut it down or sand it down so there is only 1/4" sticking out.

[iVgOnMaD]

Step 4

Take the 1 1/2" REDUCER COUPLING, and remove the threaded ring and gasket that come with it and put them aside since they are not needed.

Take the configuration created on Step 3 with the threaded side up, take the 1 1/2" REDUCER COUPLING and attach them together with the nipple side of the 1 1/2" REDUCER COUPLING going in first into the 1 1/2" FEMALE ADAPTER.



If done right, you should have the nipple from the 1 1/2" REDUCER COUPLING and the 1/4" lip of PVC on the same side of the 1 1/2" FEMALE ADAPTER.


Step 5

Take the configuration that we made in Steps 1 & 2 attach it to the configuration that we made in Steps 3 & 4 by slipping the 1/4" lip of 1 1/2" PVC tubing into the other part and gluing them together.




The 1/4" lip of black PVC that attaches both configurations together should have left the holes of the Eductor un-obstructed.


Step 6

You are finished! Use whatever PVC adapters are necessary to attach the eductors to your return outlets and see the difference in flow!



A short video that proves they work!



Hope its not too confusing, any questions please pm me.

[swissfish]

sweet, i will try that.

[iVgOnMaD]

anybody try it yet?

[Poacher]

What is the difference in performance if you use a pressure rated pump like a Iwaki vs. a Non-pressure pump like Sequence Dart?

[iVgOnMaD]

Most efficiency is achieved at 10psi, I am putting ~3 psi per eductor (using 2) and getting what you see in the video which is a 2x-3x increase in water flow. With an Iwaki, you should get a lot better results; something like a 4x-5x increase in flow since it is pressure rated.

This eductors will work with any pump, maybe even powerheads, but the less pressure the pump can handle, the less efficient the eductor will be...

Powerheads can't create very much pressure at all, even the larger ones, so it will probably be very inefficient on one of these. It should still work though.

I would try to shoot for at least 300gph per eductor, with a pump rated for a max head of at least 15ft.

[Emokidjosh26]

I don't use an eductor but I do use a penductor for the return on my tank and I like it. Here is a picture of what it looks like. The pump that I use for the return is a Sedra 7000.

[iVgOnMaD]

Yup, that is the same thing, they just started using the name penductors, not sure if it is even the appropriate name for them ... Those are the ones I am talking about when I say that some are adaptations from industrial mixing eductors.

Click here for more info on the ones that are sold commercially!!

These require a higher pressure pump than the ones I made.

[iVgOnMaD]

Bump. Anybody try them yet?

[MVEED3]

Cool design. I'm definitely setting this up in the new tank.


Allen

[iVgOnMaD]

Let me know how it goes and post some pics

[Vayder1]

Question - can I add these to my SeaSwirls?

[dj9264]

Tom, I've had one on a 3/4" SeaSwirl for over 1 year. Works great. No leaks. Using a T-3. Little algea loving fish can get sucked in though.

[iVgOnMaD]

Others have posted on my thread on RC that it works very good with their Sea Swirl.