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Old 10-03-2005, 03:29 PM   #1
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Did you buy a SCWD and hate it?

Well so did I, I built a closed loop and bought a SCWD and attached it to a Mag drive 950, I thought this would be great... Wrong! So I stop at the LFS and picked up a Mag 1200 and thought this HAD to be better, NOPE, What the hell is going on I thought I did everything right and NO pressure. So I went to the SCWD web site and watched the video about 3 or 4 times then it hit me in the head like a ton of bricks. When you build your closed loop you use 3/4 pvc pipe all the way back to the inlets right? Yes. If you look at the video there inlets are a 1/8 to 3/16 slit ... Same concept as putting your finger over the end of a garden hose,increase pressure.So instead of rebuilding my closed loop here is what I did.Took a propane torch on very low,Heated a 90 degree elbow and closed one end, Well let me tell you,Holy mackeral, Not only is it breaking the suface its creating small vortexes around the tank. Here are a couple of pics...plus I figured if it worked for the closed loop why not the return from the sump, That has a Mag 700. tank 1 pic, That shoots across the back of the tank.
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Old 10-03-2005, 03:33 PM   #2
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Thats cool did you get that idea for the closed loop from Melev?

I would like to see a pic of the whole set up if possible, thanks.
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Old 10-03-2005, 03:57 PM   #3
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Yes thats where I got the idea from,but his is on a 29 gal tank and mine is on a 75gal. Give me a couple of hours and I will post pics of the hole setup.
With those 90 degree elbows closed down it works like a charm and is whisper quiet. Before I did that the pipes were actually banging and no matter what I did it wouldnt stop.
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Old 10-03-2005, 04:14 PM   #4
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So what was the problem with the SCWD? Was it just too much restriction on the flow?
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Old 10-03-2005, 04:23 PM   #5
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Would diping the part of the pvc to be shaped in boiling water work as well? Thats what I would have tried first if I was just doing it on my own, with no advice.
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Old 10-03-2005, 05:17 PM   #6
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Quote:
Originally Posted by Gatorfreak
So what was the problem with the SCWD? Was it just too much restriction on the flow?
With having 3/4 of an inch all the way into the tank it seemed like the water had no pressure coming out of the inlet, When you restrict the flow at the opening it increases the pressure coming out and the result is outstanding flow...


Quote:
Originally Posted by greenmaji
Would diping the part of the pvc to be shaped in boiling water work as well? Thats what I would have tried first if I was just doing it on my own, with no advice.
I dont think it would have worked,I dont think the heat would be enough,although I could be wrong.


Quote:
Originally Posted by revhtree
I would like to see a pic of the whole set up if possible, thanks.

Here ya go.
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Old 10-03-2005, 05:28 PM   #7
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A couple more...
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Old 10-04-2005, 12:35 AM   #8
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looks pretty good..
how big is your tank? currious..
and all those 90 degree joints are scarry 8O kidding..
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Old 10-04-2005, 01:26 AM   #9
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Not to be a downer but yes, you put your finger over the hose and that will decrease your flow rate and increase the pressure, thus the increased water movement.

Problem is, your mags aren't designed for back pressure. So i would suspect you'll greatly decrease their lifespan. If you don't mind replacing mags, you're fine. That's why some pumps (mostly external) are pressure rated and others are not. Some are designed to "push" through resistance of some sort (restricted opening) and some aren't.
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Old 10-04-2005, 02:42 AM   #10
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what is the purpose of this project? i have 2x 1500L/hr power heads and a 1500L/hr canister filter which I would like to better use to eliminate dead spots and increase water flow.
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