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View Full Version : Re Plumbing my 90 gal, how much pump do I need?


Augusta99
01/13/2010, 03:01 PM
I got 2 Tunzee Stream 2 (6005 17817gph) for xmas and installed them in my 90 gal tank to reduce power consumption (turned off my old external closed loop). Now I'm thinking of replacing the main filter pump, but how much of a return pump do I need with the two Tunzees going?

My main return line is 1", and is split into two 3/4" tank returns. Based on a 10x tank turn over I need about 900gph (@ 4ft), but is this much turn over required given the in tank circulation I have going on?

Can I get a way with 500-700 gph to save additional power cost and tank heat? I'm assuming I will also get less pump noise with a smaller pump.

Also will I have problems finding a small pump that can support my 1" return line?

Any recommendations for a good pump for this situation? I wanted to go with a submersible pump to make my plumbing rework easier. I was considering the RIO 12, 14, & 17HF (630, 660, and 840 gph @ 4ft). Would any of these work?

Thanks!

fufu
01/13/2010, 03:05 PM
I would go with an eheim 1262, its about 900 gph at 4' head. Quiet and durable. You can reduce the 1" to fit to the ehiem and it would work.

ChadTheSpike
01/13/2010, 04:00 PM
Do you have a drilled tank?

I ask because if you have a siphon overflow with a u-tube, you may want to downsize to a smaller capacity (i.e., match your flow), if its a drilled tank you dont have to worry about this.

The eheim 1262 is a good recommendation, it will give around 600 gph when plumbed into your system (Im guessing anyway).

Augusta99
01/13/2010, 04:14 PM
The tank is drilled with a 1 1/2" overflow

hyperfocal
01/13/2010, 05:41 PM
I'd go a lot lower. IMO, the flow rate through your sump should be comparable to the flow rate through your skimmer -- much more than that is wasted energy. I'm running around 150gph through my sump on my 55gal tank.

As far as plumbing a smaller pump in, Home Depot has a wide range of adapters so that shouldn't be much of a problem.

Fish Ace
01/14/2010, 05:11 AM
I would go with an eheim 1262, its about 900 gph at 4' head. Quiet and durable. You can reduce the 1" to fit to the ehiem and it would work.

Closer to 665 @ 4 feet according to specs, which should be just about right for a 90.

fufu
01/14/2010, 05:26 AM
Closer to 665 @ 4 feet according to specs, which should be just about right for a 90.

yes, I agree, I dont know why I put 4' head, suppose to be 0'

Augusta99
01/14/2010, 10:12 AM
Thanks everyone! I was thinking a large pump wouldn't be needed since my in take circulation was managed through the tunzees. Saves a little energy used for the tank by using a smaller pump!

For the pipe conversion up to my 1" size:
-is it better to do the conversion closer to the pump?
-or closer to the top of the tank?

Thanks again!

hyperfocal
01/14/2010, 10:53 AM
I've always done it closer to the pump... more for convenience than any other reason.

ChadTheSpike
01/14/2010, 11:14 AM
Closer to the pump is better. Smaller piping greatly increases the head loss in the piping, so the more piping you have at larger diameters the better (if you read the fine print at the bottom of mag drive pump curves, youll find all of the numbers assume 1.5" ID piping is used, not the case usually I am sure). In your case, youll probably find a 3/4" output on a smaller pump, the 25% increase in diameter yields an almost 80% increase in area... thats a huge difference.

Augusta99
01/15/2010, 11:08 AM
Thanks a bunch! Got the new pump installed and everything is working great!!!!