Please help with matching overflow to pump for a sump system.

[flower]

I was looking into getting the pump and overflow for my 30g tank converted into a sump/fuge. I am finally ready to order...
2Quills said to get Ehiem 2000 and the small CPR overflow. I want to use the Ehiem and CPR equipment. The thing is in order to not go to two different online stores and pay shipping twice, I want to use one online store to get both items.
Foster and Smith sells Ehiem but none of them match the CPR overflow.
For example:
The small CPR overflow CS50 ¾ bulkhead says 300 GPH
However the Ehiem they have available:
Example:
Ehiem 1250 has 320 GPH
I was told to make sure the pump matched the overflow…can anyone give me some insight on what to do here? Nothing seems to match

I can go to a place called Aquacave
They have the CPR overflow CS90.....600 GPH
But the other pump I was told to get is a Mag 7, no Ehiem ... 700 GPH
Thanks for any help you can offer...

 

[acrylic51]

Flower....either combination you listed would be fine IMHO....The reason I'm stating that it's ok is the pump is stronger than the overflows capabilities. IMHO I'd rather have a little more pump than not enough. With that said you can always put a valve on the output side of the pump and turn the pump down if need to match the overflow. I say throttling it down within reason. You still have to take into account the type of plumbing your going to use, fittings and, the length/height of your plumbing run, which will add to your head pressure, and will cut some of the flow to begin with.
You couldn't find a place that sells the Eheim compact like you used on your last setup? Eheim IMO is a better pump than the Mag and would advise the Eheim, but the Mag would work as well. I only suggest the Eheim compact only because it has the valve already there to adjust the flow. With your first scenario of the Eheim 1250 and the overflow I would opt for a slightly larger pump. What are the specs on the Eheim 1260?

 

[flower]

This is going on a 30g tank 3.5 foot from floor to the top of the other tank. I think th 1260 is too big. As you know I'm not handy so I'm hoping to match the output size to the 3/4" hose and not play with adaptors. I do want to put valves on each line like what Corey did for the 90g...I hope that size (3/4) is available for those.

Thank you for the help!
1260 Universal Hobby Pump Specifications:
* Output GPH: 640
* Head Height: 12 ft.
* Power Watt: 65W
* Intake: 1"
* Outlet: 3/4"
* Dimensions: 6.25” x 8.5” x 4.5”
The CPR is only 300 GPH
So I thought it would be better to get :
1250 Universal Hobby Pump Specifications:
* Output GPH: 320
* Head Height: 6.5 ft.
* Power Watt: 28W
* Intake: 3/4"
* Outlet: 1/2"
* Dimensions: 4.75" x 7" x 3.75”

 

[acrylic51]

Flower doing a little searching on the Eheim 1250 here is the flow chart.....Looking at the graph using 4' of head pressure your at about 200gph....Not enough for the overflow doing 300gph IMHO.
http://www.***********.com/pumps_eheim_universal_hobby_powerheads_information-ap.html#1046_1048_1250
On the bottom graph you can see the 1260 is a little more pump, but with a valve as you want to use is more what would be the ticket....Here in the next link is the compact which you already use, and this is the best choice IMHO....
http://www.***********.com/ps_ViewItem.aspx?&vendor=&idProduct=EH11036&tab=1
The outlet of the 1260 is 3/4" which I'm assuming your using for your return line.....Whereas the 1250 is 1/2" output which you'd probably adapt up to 3/4"????

 

[acrylic51]

You don't want to get caught up in a deal with not enough flow to keep the overflow running right, and to small a pump will put you into that boat.

 

[flower]

Quote:
Originally Posted by acrylic51 http:///forum/thread/383043/please-help-with-matching-overflow-to-pump-for-a-sump-system#post_3347019
Flower doing a little searching on the Eheim 1250 here is the flow chart.....Looking at the graph using 4' of head pressure your at about 200gph....Not enough for the overflow doing 300gph IMHO.
http://www.***********.com/pumps_eheim_universal_hobby_powerheads_information-ap.html#1046_1048_1250
On the bottom graph you can see the 1260 is a little more pump, but with a valve as you want to use is more what would be the ticket....Here in the next link is the compact which you already use, and this is the best choice IMHO....
http://www.***********.com/ps_ViewItem.aspx?&vendor=&idProduct=EH11036&tab=1
The outlet of the 1260 is 3/4" which I'm assuming your using for your return line.....Whereas the 1250 is 1/2" output which you'd probably adapt up to 3/4"????

I get so confused with the input output stuff.
I need the Ehiem 1260, because the smaller will lose too much pressure as it travels up the hose to the DT??? The line OUT going into the DT is 3/4 so I will need a 3/4 inch valve..is that correct? Does that one have a knob to dial it down like the 3000 model too or am I relying on the valve to control everything?

 

[acrylic51]

The 1260 would be my choice. Overall flow capability is greater on the 1260 vs the 1250 regardless bumping hose size to the DT. The 1250 & 1260 do not have the control valve on the pump as your compact on your other setup, so yes you would use your main valve you install to control the flow back to the DT.

 

[2quills]

That's kinda why I was suggesting the compact 2000 pump. It's adjustable from 265-528 GPH with no need to install a valve. But I know you don't like the suction cup feet on the other one.

 

[flower]

The feet are not any big deal...I was trying to get the pump and overflow from the same place to save on shipping costs. I can't find a store selling the Ehiem 2000 + the CPR overflow.

 

[2quills]

Found a place...pm sent.