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thekeyofb 03-13-2009 07:14 AM

Return Pump Advise Needed Please
Okay, this is a deep question for me. So, let me try to explain it the best way I can. So, here goes nothing.

- I have a 75gal tank with a overflow rated for 600GPH
- I have a 30gal sump tank
- I have a Quiet One 2200 return pump.
- The return water is running through approx. 7 to 8 feet of 1" hose
- It also passes through 4 x 90 degree elbow joints.
- From pump outlet to in-tank return outlet is approx. 4 to 5 feet vertical

I think that my tank will benefit from having the water filtered at the highest rate possible. So, I want to increase my filter turn-over rate. I'm thinking about upgrading my pump.

Does anyone have any opinions on what type of pump I should purchase that will give me the maximum flow rate or slightly over? I have had a great experience with Quiet One. So, I was thinking about the Quiet One models 4000HH, 5000 or 6000.

I'm sure there are other pumps and brands that are just as good if not better. So, I'm also looking for opinions on other pump brands that are as quiet and will give me the same type of great performance that I have gotten from my Quiet One 2200?

PS...I know that the overflow is rating for 600GPH. However, will going slightly over that rating really jeopardize my tank? I need as many opinions as possible.

jsoong 03-13-2009 07:57 PM

Personally, I would never go over the overflow's max rating. Even though it might work well at first, you are risking a flood if there is any little obstruction (say a bit of algae buildup) or if your water level fluctuates a bit (with evaporation). With a HOB overflow, I like to have a large margin for error.

I use a Hydor pump at 750 gph. It had been reliable, but louder than I would like.

thekeyofb 03-14-2009 04:00 AM

Thanks for your reply. However, this is not a "hang on the back" overflow. My overflow is actually built inside the tank. Does this make a difference in your opinion?

thekeyofb 03-14-2009 04:01 AM

Also, can anyone else chime in on this?

MichaelsLilGray 03-14-2009 04:05 AM

go to lowes and get a pond submersable pump... they have them all the way up to 3500gph... and quite nicely priced.. i ran one that pumped 500gph till it drained my sump.... it was extreamly quiet while it had water in it. now im running one thats 150-200 gph.. i cant hear it over the water and the air pump...

CaptainAhab 03-14-2009 08:54 AM

Probably a Mag9 would do you.

Remember you can't fake the math. 600 down the drain, you need approx 600 up the return. Have you ran the calcs thru here? Reef Central Online Community

jsoong 03-14-2009 02:12 PM

An internal overflow will be safer when overloaded, since the driving pressure will be increased as water backs up in the display & increase the capacity of the system. However, you really can't push it over the limit too much or you'll always be worrying about flooding.

There are ways to increase the capacity of an internal overflow. Depending on where the bottleneck is, you might: widen the raker teeth slots, increase the return line size or get rid of the elbows. However, unless you ahve a good reason for the increased flow, you might just as well stick with the capacity of the overflow & find a pump to match.

CaptainAhab 03-15-2009 03:21 PM

Increasing the teeth size will only help you get closer to the max gph. A 1" drain is a 1" drain.. The old saying you can't put 5 pounds of *cough cough* in a 1 pound bag remains. If you want more than 600 , get a bigger external overflow, drill another hole, widen the hole (drilling wise, non of which is an easy thing).

thekeyofb 03-16-2009 04:04 PM

Ok........(Captain) I tried to do the calculations using that link. However, the model pump that I use is not on the list. I use a Quiet One 2200. Anyway, the purpose of this post was to see if I can push my flow rate to the max or a little over it.

I really want my filter system to be as efficient as possible. I plan on keeping some easy corals and maintain a small reef. So, filtration is very important to me. I have removed 2 of the 90 degree angles. I am also going to reduce the length of hose. I guess my question is how far past 600GPH can I push my internal overflow?

CaptainAhab 03-16-2009 04:17 PM

You can't. Now this is all an approximation.. but.

A 1" drain will drain approx 600 gallons per hour (gph). Using that approximation as fact, you can't change that. It's physics. You return pump is not sucking water down your drain pipe. Your return pump is pumping the water out of your sump. If your return is too powerful ; empty sump/burned out pump/possible display overflow. If it is not powerful enough ; possible sump overflow/big sucking sound in your overflow from not enough water in the display.

If you want more gph the you need... bigger drain holes, more drain holes.

Increasing the pipe size will not work either.. A 1" hole is a 1" hole even if you enlarge the pipe thru reverese reducers to 1 1/4, 1 1/2, etc

As always... IMO

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