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Old 10-29-2013, 07:46 PM   #411
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Use the kiss effect IMO.
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Old 10-29-2013, 07:48 PM   #412
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Thats what I tried to do, lol, but it isnt working as well as I had hoped.
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Old 10-29-2013, 07:55 PM   #413
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Correct that the mag 9.5 and 18 have a 3/4" mpt. However, manufacturer recommends minimum 1.5" ID after that for max flow. Can you maybe do 1.5+ PVC up to a Y or T and then split lower ID tubing after that?

You are basically having reduced flow with the initial 3/4" and then essentially just splitting that lower flow in half at the T or Y
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Old 10-29-2013, 08:36 PM   #414
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1.5" return? that doesn't sound right. I use a 5'8" I.D. flexible hose for my mags and have no trouble with them.
That's something that's always puzzled me. How can these pump manufacturers say that even though the outlet is 3/4", and you can only put so much water through a 3/4" hole, if you connect a larger pipe, more water will come out of that 3/4" hole? Sounds like it defies the laws of physics.
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Old 10-29-2013, 08:45 PM   #415
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You can't increase the flow or pressure by increasing the diameter of the feed line above the diameter of the pumps outlet, BUT you can reduce flow rate by adding restrictions, like 90 degree elbows. If you reduce the feed line diameter you reduce the flow but increase the head height. So the idea is to reduce restrictions to increase the efficiency of the pump. In your case it may be more efficient to use a pump on each of the return lines. Basic hydrodynamics can get complicated.
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Old 10-29-2013, 08:46 PM   #416
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Quote:
Originally Posted by Gregcoyote View Post
You can't increase the flow or pressure by increasing the diameter of the feed line above the diameter of the pumps outlet, BUT you can reduce flow rate by adding restrictions, like 90 degree elbows. If you reduce the feed line diameter you reduce the flow but increase the head height. So the idea is to reduce restrictions to increase the efficiency of the pump. In your case it may be more efficient to use a pump on each of the return lines.
But, they state this not knowing your application. They have no idea about whether you will have 90's or head height.
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Old 10-29-2013, 08:48 PM   #417
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That's correct. The pumps are speced with no restrictions in the line and the supply and feed lines are same diameter as the pumps. That's why I suggested going with the original working setup.
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Old 10-29-2013, 08:50 PM   #418
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So, Mr X, what do you think of my issue with low flow coming out of the outputs? You can see the pictures of what I have set up what do you think?
Thanks
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Old 10-29-2013, 08:51 PM   #419
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It is counter intuitive but increasing diameter of plumbing does increase flow. you would be surprised by the difference.

Now 1.5 is bulky but would be best used at least up to a T or Y.
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Old 10-29-2013, 09:00 PM   #420
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Quote:
Originally Posted by erichm20 View Post
I just looked at the pics again and it appears tht the other line is going back up to feed a second return which I would expect with a large tank. If that's the case you have 900 gph going to each return with almost 4.5 feet of head loss (3ft stand plus 20" high tank i think) so that puts 450 coming back into the DT at each return. This would also explain why the prev owner had 2 mag 9.5s, one feeding each return. You will be supplementing flow in the tank with powerheads so you could leave it, or an alternative is to come over the back with one overflow and use locline and a Y to spread it out. This would give you closer to 1300 coming back in.
Something like this, combined with the "T" fitting slowing you down. I would drain all water to the sump and return all water back to the DT. Trickling water back to the sump is unnecessary.
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