DIY Group Project - Eductors - Page 7

reefBoyDc · 10-02-2006, 02:13 PM

Quote:

So... direction of the water is from right to left in this diagram?

reefBoyDc · 10-02-2006, 03:33 PM

Quote:

Originally Posted by reefBoyDc

So... direction of the water is from right to left in this diagram?

Let me answer my own question: "Yes you dope... duh."

reefBoyDc · 10-02-2006, 05:07 PM

Might this work? It's a 1/2 MPT to 3/8 Insert inside a 3/4 MPT to 3/4 Insert. I wanted a smaller eductor, since my tank is not very big. The bottle cap is for size reference.

Geoff · 10-02-2006, 09:54 PM

yes, that will work. eductors are not very usefull in smaller tanks. the pumps required to get enough oomph to work the eductor will send things flying in the tank!! if you use smaller pumps than the eductors inner nozzle will just act like a tiny nozzle and produce a beam of water instead of the wide flow pattern which is normally associated with an eductor.

by all meand slap that sucker on your pump and see. just make sure the flow coming out of it is wide and not a beam. it helps to put your hand in front of the eductor. you can easily tell what kind of spread pattern is being produced.

G~

darthteddy · 10-02-2006, 10:47 PM

I built the 3/8ths educter today. Was a fun project going to about 6 hardware stores to fund the right parts. Ended up buying the parts i needed for about 3 bucks and spent around 60 bucks on stuff i didnt...Looks like im gettin a new 10 g set up soon...LMAO

Well i built it and turns out i dont have any Pressure Pumps Layin around or even a pump at all

So mabe il use it a lil later in life

lol

reefBoyDc · 10-03-2006, 09:08 AM

I have a bit of extra pluming to do before I try it out. I currently have 6 return outlets. Need to block 4 of them. The pump is an Iwaki MD70RLT (Flow Rate @ 4 Head: 1500 GPH, Max Head ft: 31.8), but it's already got 7 feet of head working against it (basement sump) and a sqwd. I'll let you know how it works out.

charlie · 10-10-2006, 12:05 PM

Would an Iwaki 100drive 6 of these at about 12 feet of head??? I want to use them to clean the bottom on my 8' 300 gallon tank. This is gonna be added to an existing closed loop. Outlets are 3/4". I have 3 outlets, each would use 2 eductors. Hope this makes sense!!!!

Geoff · 10-10-2006, 08:37 PM

according to this site 4 would be a good number of eductors for an Iwaki 100.

i have not tried that many eductors on a pump, but i would think that 6 would be to many. not saying that they will not work, but they may not push as hard as you want. if you are only needing to move detritus out a few inches than that many eductors may work great. but if you are needing to push detritus out more than 12-18" than they may not have enough oomph.

i am purely speculating here. i was just doing some quick mental calcs using the Iwaki 100 pump curve.

G~

charlie · 10-10-2006, 09:14 PM

Hey thanx for the reply, I kind of thought that I mught be pushing the envelope a bit. Do you think I might be better off using the locline flare nozzle??

darthteddy · 10-11-2006, 08:26 AM

Do you think that a Mag5 with about 3'-4' head could drive the smallest of the eductors or mabe even 2. LMK

Geoff · 10-11-2006, 10:15 AM

Darth- no, a Mag 5 will not run 2. it will not really run one. you will lose more flow due to back pressure in the pump than the eductor would gain back. it is better to just put a 3/4" nozzle on the pump and call it good.

feel free to try it though, it is only a couple of bucks and about an hours worth of time, but i think that you will not be impressed by the outcome.

G~

Geoff · 10-11-2006, 10:19 AM

charlie- what kind of orientation were you thinking for these outlets? what size pipe is going to these outlets? do you have a drawing or pic of your thinking? 3 eductors on that pump is pushing a whole heard of water. i am talking in the 6000-7000gph range!!! you will not get that by running the Iwaki with straight nozzles. i am guessing that this is going to be a BB tank. there is no way a substrate will stay still with that much flow. you could always point the eductors towards the bottom glass and let all that flow push detritus out.

G~

charlie · 10-11-2006, 10:40 AM

Quote:

Originally Posted by Geoff

charlie- what kind of orientation were you thinking for these outlets? what size pipe is going to these outlets? do you have a drawing or pic of your thinking? 3 eductors on that pump is pushing a whole heard of water. i am talking in the 6000-7000gph range!!! you will not get that by running the Iwaki with straight nozzles. i am guessing that this is going to be a BB tank. there is no way a substrate will stay still with that much flow. you could always point the eductors towards the bottom glass and let all that flow push detritus out.

G~

Geoff, thanx for your help. There are three inlets to the tank in the back. This is for my existing 300 that will become a BB tank here in the near future. I am sorry I don't have a pic or drawing. The inlets are about 12" off the bottom. Pointing the outlets down towards the bottom would work!! Let me ask another question if I may. Do you think that an Iwaki 50 rlt would do the job also, because I do have an extra sitting around. I know it wouldn't push the same as you mentioned with the 100rlt, but would it leave the glass finish on the bottom?

This is an 8 foot tank, and I was wondering about clearing the bottom of detritus.
They are 3/4" inlets.

darthteddy · 10-11-2006, 10:40 AM

any mag out there that could efficently run an eductor thats not goin overboard?

Geoff · 10-11-2006, 08:18 PM

Darth- i had OK luck with a Mag 12. anything else you are wasting more flow due to head loss in the pump than can be gained by the eductor. physics just does not work that way.

G~