Is a MAG-DRIVE 1800 on 75g reef to much

[jesse!]

Is there such thing as to much power in returns. I want to order a Danner Mag-Drive 1800 on my 75g but not sure if its to much power. It will be at around a 4 foot head.
Specifications:
Input: 3/4"
Output: 3/4"
Flow Rate at 0' Head: 1800 GPH
Flow Rate at 4' Head: 1390 GPH
Flow Rate at 6' Head: 1125 GPH
Thanks

 

[posiden]

Kinda tough to say right on the money but in short, NO.
I don't think so. A MAG 18 with 4' of head, 4' horizontial, split returns, 4 90s, 1 ball valve, 1 union, plumbed in 3/4" pipe will give you about 750GPH. Right on 10 times turn over.
If you plumb it with bigger pipe or do 1 exit, less 90s ect.....It will give you more. Based on the real basic, basic. You will get over 900 GPH. That is a bit much. You will be wasting a lot. But the other way you can get more dispersion of water flow in the tank.
Now like I stated this all depends on your plumbing. How you do it will determine the real answer.

 

[jetskiking]

Originally Posted by JESSE!
http:///forum/post/3142738
Is there such thing as to much power in returns. I want to order a Danner Mag-Drive 1800 on my 75g but not sure if its to much power. It will be at around a 4 foot head.
Specifications:
Input: 3/4"
Output: 3/4"
Flow Rate at 0' Head: 1800 GPH
Flow Rate at 4' Head: 1390 GPH
Flow Rate at 6' Head: 1125 GPH
Thanks
Yes, there is such a thing as too much power. The natural filtration methods we use depend on contact time. Plus why use all the extra electricity if its not needed?

 

[jesse!]

because the 12 is backordered and i want to get my sump pump ASAP maybe ill tough it out.

 

[posiden]

How do you plan on plumbing it?
Give the details as to how you have it or how you want it. You say 4 feet of head, is that 2 feet vertical and a loop in the pipe??
I agree that there is such a thing as to much. You also mention a sump. Is that the case or are you in reference to a refug?

 

[pbnj]

I run a Mag 18 on my 75g reef with a CPR Overflow Box (flow rate of 600gph). However, my pump sends the water from the sump through a 1/3HP chiller before returning to the display tank, which adds maybe another 3-4 feet of plumbing to the return.
It really depends on your overflow rate.

 

[bullitr]

the more flow the better!
if i can get a reeflo hammerhead i put it in my tank but i am a little bit conservative regarding watts. my tank uses close to 2500 watts when everything is on! that is why i stick with gen x 40 and hf 32 as a return.

 

[aquaknight]

Originally Posted by JESSE!
http:///forum/post/3142756
because the 12 is backordered and i want to get my sump pump ASAP maybe ill tough it out.
Is your tank drilled or do you have an overflow box? Drilled, what size pipe is on there? Overflow box, what's it rated for?

 

[joncat24]

I would say more like a mag 9 or even a 7. There is no sense in getting a big pump that you have to valve back. If you have a standard overflow, the pump will outlfow the drain. I have a quiet one 3000 on my 120 with dual drains and still have to valve it down a bit to match flow.

 

[wangotango]

Originally Posted by joncat24
http:///forum/post/3143000
I would say more like a mag 9 or even a 7. There is no sense in getting a big pump that you have to valve back. If you have a standard overflow, the pump will outlfow the drain. I have a quiet one 3000 on my 120 with dual drains and still have to valve it down a bit to match flow.
+1. My overflow drains 600gph and I'm running a Mag-7, straight line from sump to return nozzle.
Why put a valve on a pump to dial it back? Especially an in-sump pump that runs hot? Get all the heat of the 1800gph pump when all you may need is 700.
-Justin

 

[posiden]

Drains can be run in different configurations. For instance a siphon will keep up just fine, and it will be silent.
As for the pump, it does matter on how things are plumbed. Just cause the pump says it will pump 700 GPH doesn't mean that is what you are going to get.
Watts are watts, it doesn't matter how you look at it. One pump using 200 watts is the exact same thing in energy usage and heat output as 3 pumps/powerheads totaling 200 watts.
It also matters IMO as to what the person is going to run down below. A sump is nothing more then another box of water. No filtration, just a place to hide things and gain more water mass. A refugium is where water needs to slow down and get some contact time.

 

[joncat24]

All I am saying is this....you cannot run a mag 18 without a valve on a tank with a 1" drain. Fluid dynamics rules apply. IMO I try to slow the flow through the sump to reduce flow time and turbulence , which usually results in MB's.
I was just trying to save the OP a little money by not getting such a large pump and then having to throttle it back.

 

[reefjunkiee]

why do people want alot of flow from the sump? you want low flow in the sump for filtration purposes. get your flow from a closed loop, or better yet a vortec.

 

[reefjunkiee]

Originally Posted by Posiden
http:///forum/post/3143300
Drains can be run in different configurations. For instance a siphon will keep up just fine, and it will be silent.
As for the pump, it does matter on how things are plumbed. Just cause the pump says it will pump 700 GPH doesn't mean that is what you are going to get.
Watts are watts, it doesn't matter how you look at it. One pump using 200 watts is the exact same thing in energy usage and heat output as 3 pumps/powerheads totaling 200 watts.
It also matters IMO as to what the person is going to run down below. A sump is nothing more then another box of water. No filtration, just a place to hide things and gain more water mass. A refugium is where water needs to slow down and get some contact time.
your sump is your biggest filtration besides LR, a Skimmer!! slow that flow down in the sump, your over flow will only drain as fast as your return pump. i run a mag 12 on my 125 with two over flows.

 

[posiden]

Originally Posted by joncat24
http:///forum/post/3143463
All I am saying is this....you cannot run a mag 18 without a valve on a tank with a 1" drain. Fluid dynamics rules apply. IMO I try to slow the flow through the sump to reduce flow time and turbulence , which usually results in MB's.
I was just trying to save the OP a little money by not getting such a large pump and then having to throttle it back.
No, I understand what you were trying to do. There is nothing wrong with that. Nothing at all. But, if it is only a sump......then why would he have to throttle it back? Also, I don't recall anyone saying there was a 1" drain. Even it it did have a 1" drain......doing a Herbi or a BeanAnimal drainsystem it could handle a MAG 18 and still be silent.
Originally Posted by reefjunkiee
http:///forum/post/3143470
your sump is your biggest filtration besides LR, a Skimmer!! slow that flow down in the sump, your over flow will only drain as fast as your return pump. i run a mag 12 on my 125 with two over flows.
I understand that drains can only drain what a pump puts in. How many feet of head do you have on that MAG 12?
What filtration will a sump gain the aquarist???
In the skimmer dept, any sump flowing 5-10 times the system volume is still flowing too much through to allow the skimmer the correct amount of contact time. To do it the "right" way, a skimmer should be fed by its own pump. I know some have this. Regardless, to the amount of flow through the sump it will only see the correct amount of flow being fed to it, prefferably from the overflow itself. Heck, even a line off the drain that has been measured to the right GPH is better then having a skimmer sitting in a pool of water.

 

[jetskiking]

I know some reefers that recommend 3-5 times flow through the sump. I only run a quiet one 3000 on my 120 and it does great

 

[reefjunkiee]

Originally Posted by Posiden
http:///forum/post/3143500
No, I understand what you were trying to do. There is nothing wrong with that. Nothing at all. But, if it is only a sump......then why would he have to throttle it back? Also, I don't recall anyone saying there was a 1" drain. Even it it did have a 1" drain......doing a Herbi or a BeanAnimal drainsystem it could handle a MAG 18 and still be silent.
I understand that drains can only drain what a pump puts in. How many feet of head do you have on that MAG 12?
What filtration will a sump gain the aquarist???
In the skimmer dept, any sump flowing 5-10 times the system volume is still flowing too much through to allow the skimmer the correct amount of contact time. To do it the "right" way, a skimmer should be fed by its own pump. I know some have this. Regardless, to the amount of flow through the sump it will only see the correct amount of flow being fed to it, prefferably from the overflow itself. Heck, even a line off the drain that has been measured to the right GPH is better then having a skimmer sitting in a pool of water.
another thing you need to consider is microbubbles, and cavitation and let's not forget noise. all those problems you will have to deal with in a high flow sump. learned this lesson a long time ago.

 

[jetskiking]

Originally Posted by reefjunkiee
http:///forum/post/3143580
another thing you need to consider is microbubbles, and cavitation and let's not forget noise. all those problems you will have to deal with in a high flow sump. learned this lesson a long time ago.

 

[posiden]

Originally Posted by reefjunkiee
http:///forum/post/3143580
another thing you need to consider is microbubbles, and cavitation and let's not forget noise. all those problems you will have to deal with in a high flow sump. learned this lesson a long time ago.
Again, either a Herbi or a BeanAnimal drain will allow the high flow of water without noise or air bubbles.
Cavation is eaisly solved with a down turned elbow on the intake or a simple plate above the intake to stop the formation of a vortex.

 

[jetskiking]

If it was my tank I would run a quiet one 3000. It will only draw 45w as compaired to 145w and be plenty of flow through your sump. I agree that you have to calculate for head loss, but as I said before a lot of well known refers suggest only 3 to 5 times the volume an hour through the sump.