A link to the eductor for a skimmer.

[dngspot]

I have seen comparisons to the beckett, and some have said that the eductor is better. I would like to find a link for the diy eductor used in a skimmer.
Thanks

[dngspot]

Along with posting the question, I have been searching the forums. I came across this image. The new question is do I need to scale it down to 1/2 inch to get it to work with a mag 9.5? I am also working on a design of my own and may try it out.
Thanks

[dngspot]

Anyone have any input on this?
I no longer need to scale it down but would still like to know how this compares to a beckett. I have a skimmer it would be easy to convert, but do not want to go through the trouble if someone has done it already. I will also be driving it with a Pan World 150PS.
Thanks

[dngspot]

Okay, it works. Does it work better than a beckett? I know it will need less maintenance but, the beckett seems to pull more air and the froth in the reaction chamber seems denser with the beckett. I will run it both ways, as I did not change anything in the beckett housing that changed it from its original form. At the same water level both did raise skimmate. I can add a few bioballs and make this a HSA.
I am amazed that there is no input on this thread. It makes me wonder if it has been deemed a failure in a earlier post?

[dngspot]

Here is a pic of the device.

[Fat Tony]

nice DIY... I think most people are threatened by the sound of eductors (or have no idea what they are or do) and becketts. For me, i would stick with the beckett if the bubbles are smaller and the foam is denser... for obvious reasons though. Nice idea nonetheless with sticking an eductor in a skimmer, I would have never thought of that.

[OneDummHikk]

Originally Posted by dngspot

I am amazed that there is no input on this thread. It makes me wonder if it has been deemed a failure in a earlier post?

I can't speak for everyone but I haven't commented on it because I had never seen it before I didn't know what an eductor or beckett was in March (original timeline) and haven't seen it until now because I haven't been online much the last few weeks.

The idea is appealing. One thing that might favor the eductor is on a lower pressure pump (lower head pressure) because of the sheer head loss a beckett causes (~10 feet). Not sure how much an eductor induces. I have all of the plumbing pieces to build one like the picture (except the eductor and they are easy to make).

One thing that favors the beckett is cost. A simple DIY beckett setup can be made for about 15 dollars. You can DIY an eductor but the last one I bought was over 15 dollars.

Tinkering with one this week may give me a welcome break from trying to figure out how to seal a pvc shaft in a pvc plate and still allow the shaft to turn without using bearings.

Tony, if you stop and think about how a beckett head works and how an eductor works, it becomes very very tempting to say a beckett head is an eductor.

[dngspot]

Tony, the reduction in the diameter of the pipe is what mostly causes the head pressure in this system. The beckett reduces the pipe diameter about the same as the 1/2 inch nozzle. I do not have a pressure guage that reads that low to verify how much pressure is on each (nozzle or beckett).
Bubble size is smaller with the eductor but not as dense as the beckett. With the water level about half the level in my 2 foot high reaction tube, both will raise a dry skimmate another foot into my collection cup. Both seem to produce the same amount of skimmate.

Hikk, I bought my becketts from Lowes for about $15.00. It came in a kit of other fittings for a pond. Because of the design of my beckett housing a portion of 1 inch mpt sticks out under the lid. I simply attached a 1 inch fpt to 1 inch slip coupler to the threads that stick out under the lid, I then added a reducer 1 inch to 3/4 fpt to the coupler. Then all that was left was to install a 3/4 mpt to 1/2 barb to the reducer. It cost me about $3.00 to do that. The fitting below the nozzle is a 3/4 slip to 1 inch fpt.
I agree a beckett is similar to an eductor but is more efficient in my mind.

This is not the end, I have a beckett that I have glued the original air intake holes and am going to drill 20 or so, smaller holes. Additional information can be found here. http://www.reefcentral.com/forums/sh...ht=beckett+mod
What ever performs better will be what I keep.

[Fat Tony]

Originally Posted by OneDummHikk

Tony, if you stop and think about how a beckett head works and how an eductor works, it becomes very very tempting to say a beckett head is an eductor.

Hey Randy, I'm aware of how they work. Yes a Beckett is a type Eductor. The typical differences between the two are usage and purpose. Typically an Eductor is used to create more water flow with as little restriction as possible. A Beckett is quite the opposite, it's purpose is to create more pressure causing the air mixture to create smaller bubbles and pull more air. A beckett was designed to intake air into the water flow, while the Eductor is designed to pull more water flow through the nozzle.

[dngspot]

I guess it is safe to say I am done with this. I have found a better nozzle. I posted this on RC

OMG, I modified a beckett and WOW! I filled the stock air intake holes in a beckett last night with epoxy. When I got home today I drilled 21-3/32 inch holes right at very top of the diameter of the original holes. I installed it in my Beckett housing and dang it looks like whip cream in my reaction chamber. I am running my water level just above at the point that the water comes in from, the pic will show this.
How I have been adjusting it is set my water level then slowly open the air until the bubbles in the reaction chamber start to get to big. I then back it off a little and adjust the water level for a dry or wet skimmate.
I am running the level as low as I ever have and the thing is pushing skimmate up like crazy. I guess I will have to reduce the air to adjust for my skimate now. No mater if I have the air completely open the bubbles are so small it looks like whip cream. My guess is that my skimmer is too small for the pump and optimized beckett.

In the first pic is my water level. From the bottom of the box to the top of the reaction chamber is 20 inches, from the top of the box to the top of the reaction chamber is 15 inches, from the top of the reaction chamber to the top of the riser spill over is 10 inches (includes intermittent tube and the spill over) and the reaction chamber has a 6 inch diameter. My pump is a Pan World 150PS.



The next pic shows what happens in 2 minutes after I turn the air valve all of the way on.



This pic is from a un modified beckett with the air valve 1/2 on. Also the starting water level was 3/4 high in the reaction chamber.



The final pic is of the skimmer after 3 minutes with the air valve completely open.



You guys are awsome.


Her is the link. http://reefcentral.com/forums/showth...hreadid=958085

[OneDummHikk]

dng, did you experiment with the number of holes and sizes or just follow the RC thread on it? I have been following the RC thread on the modified becketts and was curious how you came up with number and sizes of the holes to use. I have wondered if it would help (with a higher pressure pump) to have two rows of holes, one at the top of the original hole and one at the bottom, in a staggered ring around the beckett.

[dngspot]

I did not post a pic of the beckett of purpose, it looks rigged. The original poster Waylander used 20 1/16 holes, a guy named rivan came along and tested 1/16, 3/32 and 7/64. Rivan also attempted different locations and amount of holes. He was using a pump that is similar to what I have and had the best results with 20 3/32 holes. I wanted the same amount but making things look even came out with 21 3/32 holes. I drilled them from the inside to out, from the inside they look great, from the out side they wonder a little. The important thing is to locate the holes just under the ventury and above the ball. There is a sharp ledge at this location inside the Beckett. This is why I drilled from the inside. I would have done better if I would have used my drill press.
It is my understanding that sometimes the row of lower holes can spray water out of them, instead of pulling air in. This is why I did not do a second row.
The Pan World 150PS is pressure rated.
The project took 10 minutes to plug the original holes, and 10 minutes to drill them. This is a quick mod.
This pic showes the location to drill the holes.

[OneDummHikk]

The pic doesn't show up. Knowing how you decided on the holes was the biggest thing. Thanks. It gives me reason to pull mine out and start modding them (the becketts).

[dngspot]

I certainly do not regret it. I fixed the pic, sorry about that.