10 replies to this topic

[D&RW]

Anybody know the name of the fitting you can put on the end of a pipe to enhance to flow? I'm thinking of using this to create more of a current coming off my filter.

[D&RW]

did a little research. they are called eductors. the question I have is are they safe for fish. Apparently they work by drawing in extra water via a vacuum effect and that increases the flow by up to 1.5.

http://www.aquaticec...tors/eductors/0

here's what i have in mind. run a 4700 gph pump about 10 feet into the Aqua UV Ultima II w/2 in. intake. Run it back into the pond directly and then down to the first shelf. Use a soft 90 and run the 2 in pipe along the edge of the pond past the skimmer to the new, expanded plant shelf. Split the flow using a standard ABS Wye so there are two outputs, one above the other. The one on the floor will be to sweep detritus off onto the deeper part of the pond--it will have a 45 degree fitting to facilitate the sweeping effect. The one coming off the Y about 1.5 ft up will be strictly for creating a current. both will have Eductors on them.

whattya think?

[DrCase]

That fitting looks very interesting...
I would think it could suck in small fry that got to close,
but it would only take them for a ride
the big koi should like it..
I wonder if it would restrict the flow on a gravity system ?
if you get one let every one know how it works

[DoDad]

I would not put one in my ponds.
1.They stick out in the pond and can cause damage to fish when spawning or if spooked.
2. They cause back pressure one the pump which would reduce the flow through your filters.
I would add TPR's with there own pump.

[D&RW]

I'm very curious, but the darn things cost +50$. I think I'm going to hook up the line with the two outputs and see how much current it creates. IF it doesn't seem satisfactory then I'll give these eductors a try.

[DrDave]

Video would be nice, that is better than a photo.

[koikeepr]

eductors are supposed to create 4 gallons of flow for every 1 gallon of water. You can get a similar result much cheaper by simply reducing the size of your fitting at the end of the line. For example, of you have a 1 1/2" pipe/hose, just throw a 3/4" fitting on the end to reduce it. It will force the water to come out faster through that smaller opening.

[D&RW]

Thought about that, i.e. putting smaller fitting on the end. The difference, I think, is that the eductors do not add to back pressure on the system.

[koikeepr]

then sounds like you gotta spring for the $50 bucks.

[DrCase]

I would believe every time the pipe gets reduced ...back pressure will increase
that's why i think on a gravity return , problems would occur

[D&RW]

like say, I think I'm going to wait until I see how the straight pipes work for delivering enough flow to create a good current. I haven't decided yet, but I may go with three output pipes instead of just two. I don't have a gravity system. Frankly I would have preferred to be able to set one up, but the extra digging and creating a house for the settlement chamber and pump etc just was too much. so my entire system is pressure driven by submerged pumps. This particular pump (80 gpm) will sit in the skimmer with feed to the Ultima II and the return will come in over the wall next to the fence, drop down to the first shelf, then snake around to about 6 ft past the skimmer. there the 2 in pipes will sit against the wall and be split as in the diagram.

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