sump return pump

[kdirk]

I'm setting up a 125g with a 55g sump, my 125g has 2 Magaflow overflows each rated at 600gph. my pluming is longer to one than the other so do i run 2 pumps or one and what size?

[Ti]

Look into the Eheims

[kdirk]

eheims look high in wattage to gph compared to rio but i don't know about rio either i'm still wondering if i run 1 or 2 pumps

[sjm817]

Eheims push more water than their ratings state. They do much better in the headloss area than other pumps, so real world flow is very good. A 1260 would be a good pump.

[Ti]

By how much do the eheims break their rating in general?
Has anyone tested this?

[crumbletop]

For 2 overflows, the eheim 1260 or 1262 would be a good choice. Use one pump for both overflows. It could be used as either an in sump or an external return pump. If your sump is plumbed for an external, you could look into some other choices as well.

Jack

[sjm817]

<a href=showthread.php?s=&postid=7097033#post7097033 target=_blank>Originally posted</a> by Ti
By how much do the eheims break their rating in general?
Has anyone tested this?
I never put the effort into actual measurements, but an Eheim 1260/1262 way outflow their Mag7/9 counterparts. This has been observed by many users.

[Ti]

Intersting

[kdirk]

By only using one pump to run back to both overflows with diffrent headloss presures cause of longer pipes to the one side wouldnt the use of one pump make one side push more then the other? Sence water travels to its less presureized releif point.

[sjm817]

From my own exp, a lot of it is due to headloss performance. If the Eheim and Mag were both sitting in a bucket, they might move the same amount of water. Once you hook plumbing up to them, that is where it changes. The Eheim can push water through plumbing a lot better. Another thing I've seen is the flow rating is based on Euro 50Hz. USA 60Hz would make a 20% increase, but I dont know if that is true.

[sjm817]

<a href=showthread.php?s=&postid=7097651#post7097651 target=_blank>Originally posted</a> by kdirk
By only using one pump to run back to both overflows with diffrent headloss presures cause of longer pipes to the one side wouldnt the use of one pump make one side push more then the other? Sence water travels to its less presureized releif point.
The pump does not connect to the overflow. It pumps water into the display tank. The water rises and 'overflows" into the overflow boxes. One pump would be fine. You could have 5 overflows, it wouldn't matter.

[kdirk]

I have 2 overflows within are 1 send and 1 return 1 1"hole and 1 3/4"hole so I've got 2 return lines the one further from the return pump will have less water volume

[crumbletop]

The overflows will work the same with one pump vs 2. The return pump flow does not have to match the drain flow within a single overflow. As long as the total flow from the return pump is less than the combined overflows can handle, then you will be fine. Think of it like this:

1) You have NO return flow, just the overflows that drain to the sump.
2) You dump a bunch of water from a bucket into the tank.
3) The water will "over flow" and go down the drain to the sump. It doesn't matter which drain works faster or slower, the water still flows to the sump. It doesn't matter if you dump the water closer to one drain or the other. It doesn't matter if you dump the water slowly or fast, as long as it is not too fast for the drains to handle.

A pump from the sump back to the tank works the same way. It doesn't matter where the water comes from. The pumped water raises the water level in the display tank, and this water spills over into the overflows.

Hope that helps.

Jack

[sjm817]

You can split the return from the pump with a "Y" fitting. It's ok if you have less flow through one of the returns..

[kdirk]

I was looking at a eheim 1264 its rated at 1200 at 0 headloss, with headloss that should match up with my 2 600gph overflows ok do you think?

[crumbletop]

I think that is a pump that is not available in the US and may not be manufactured at all. If I recall correctly, it had some problems when it was being developed. As far as I know the 1262 has the most flow you can get from an eheim. It should be plenty for your new tank.

Jack

[sjm817]

I Assume you are not in the USA. You cant buy a 1264 here. I wouldn't use it. Too much flow for a return pump. You generally want 2 - 5x display volume or so. That is 250 - 625 GPH for a 125. I've seen people who have the 1262 who say it too strong, but with a 55G sump, it would probably be ok. 1260 or a 1262 if you want stronger flow.

[unmc2001]

I have the eheim 1260 in my 20 gallon sump and 58 gallon display. I would go with the eheim 1262 for your 125 with 2 overflows. You can always put in a ball valve and dial it down if you need to.

[kdirk]

I just seen it online, I did not know you can't get it in the US. I will go with the 1262. thanks