gph question

[bandr1002]

i am looking into upgrading to a 75 gal reef and i have a quick question about the fuge. i have a bro who could hook me up with a 600gph lifereef overflow box but i am concerned about the pump to get. i have been looking into an external magdrive, but they only make a magdrive 5 or a 7 which one of these would be best?

is this a good overflow box

now i know that it is a 600gph box so i should not get a pump that is over that, correct?

[nicole977]

You could probably get a pump that is rated a little over 600 gph and just put a ball valve after the pump outlet to cut the flow back to about 600 gph, so the tank won't fill faster than it drains. It shouldn't hurt the pump. Just don't close or restrict the flow into the pump, b/c that will damage your pump.

[kensilvey]

Get the mag 7, ball valve the output only. Try to have it external,as it will add heat to the water if internal. They are a cheap pump, I have two mag7, two mag12,and 1 mag18. The larger ones are better built. A better choice would be a little giant pump but more money! I broke one of my mag 7 pumps by overtightening the impellar housing screws. I also own 4 little giant pumps (3mdqxc) and they have a track record of 8-10 years if oiled every 6 months.

[bandr1002]

not sure what you mean by ball valve, you guys have a pic. also how would you determine when it is correct. i have never owned a refuge before and up until this new project i have only had hob filtration

[AZDesertRat]

Mag pumps add the same amount of heat to the water regardless if they are internal or external. They have internal passages or water jackets inside the motor windings which use product water to cool no matter where they are placed. Mags run hot compared to other pumps like Ocean Runners or Eheims and they are noisy in comparison besides using more electricity.
Figure your head loss using the head loss calculator on the main RC page the get a pump that matches that plus the overflow rate.
If its slightly larger you can install a PVC ball or gate valve on the discharge side of the pump to slightly throttle the pumps output to match the overflow box. The pump and overflow will balance themselves out once set correctly.

[moondoggy4]

I used to run a fan on my Mag 7 because it would be hot to the touch now I have it in the sump.

[abarrera]

acuacave has MD2 and MD3

[bandr1002]

if the mag runs this hot i am not sure i am going to want one. i do not have a chiller for the summer time and i would like to have a quieter cooler pump, what do you all suggest

p.s. i am on a budget of sorts lol

[AZDesertRat]

Ocean Runner or Eheim. Probably an OR2500 or Eheim1260.

[bandr1002]

<a href=showthread.php?s=&postid=14097997#post14097997 target=_blank>Originally posted</a> by AZDesertRat
Ocean Runner or Eheim. Probably an OR2500 or Eheim1260.

i take it that with a 1260 it will be pumping out 1200gph?? if so the ball valve will be needed is this correct?

[AZDesertRat]

The Eheim 1260 is rated at 635 GPH at 0 feet of head.
Here is a link which shows what you can expect for flow at various heads or heights.
http://www.marinedepot.com/ps_ViewItem.aspx?idProduct=EH1046&tab=1&child=EH1260

The OR2500 is rated at 650 GPH at 0 feet so they are essentially the same.
http://www.aqua-medic.com/products/docs/OR_Pumps.pdf

[d2mini]

<a href=showthread.php?s=&postid=14096073#post14096073 target=_blank>Originally posted</a> by bandr1002
not sure what you mean by ball valve, you guys have a pic. also how would you determine when it is correct. i have never owned a refuge before and up until this new project i have only had hob filtration

This is a true union ball valve. Not only can you adjust the flow with the red handle, but you can unscrew the valve from either side, making pump maintenance or plumbing changes very easy.


http://img.alibaba.com/photo/10832960/PVC_True_Union_Ball_Valve.jpg

[mjw357]

<a href=showthread.php?s=&postid=14096430#post14096430 target=_blank>Originally posted</a> by AZDesertRat
Mag pumps add the same amount of heat to the water regardless if they are internal or external.

I disagree. Yes, some heat is being exchanged with the water flowing through the pump. But the outside of the pump gets quite warm, too. That heat goes to the room air instead of your sump water when ran externally.

[AZDesertRat]

Heat transfer through air is nothing compared to through water. There have been numerous tests that confirm what I stated earlier. By far the bulk of the cooling is via the internal water passages.

[bandr1002]

<a href=showthread.php?s=&postid=14100245#post14100245 target=_blank>Originally posted</a> by d2mini
This is a true union ball valve. Not only can you adjust the flow with the red handle, but you can unscrew the valve from either side, making pump maintenance or plumbing changes very easy

thanks for all the info, i greatly appreciate it

[davidr]

i have a 75g reef with the same overflow your talking about. I also have a magdrive 7 in my sump going up about 4ft up with no restriction and it's been perfect for 3yrs now. My wife keeps the house hot...about 77 degrees F and i've never had a heat problem...tanks maintained @ 76 to 76.5 all year. For what it's worth I may not have the experience of these other guys but it's what I started with and it's worked great.