what size pump

[shua]

what is the gph that i should use for my 250g with 55g sump? my overflow has two holes that with a bulk head are 1 1/4'' my siphon hose that goes into the box is also just 1 1/4'' .

i was thinking just getting a 1000gph and putting a ball valve on it to regulate the water flow but let me know thanks

 

[Dane]

I would look for a pump that would push 1200-1500gph AT THE HEAD that you have. So you are probably looking for a pump in the 2000gph range. You can always regulate down but it is awful hard to make a pump push more.

 

[shua]

i have a 6' head and the pump is 1000g @ 13' and i was thinking of a ball valve on the ends of my intakes. is there a pump that has a regulator on it?

 

[KaiserSousay]

i have a 6' head and the pump is 1000g @ 13' and i was thinking of a ball valve on the ends of my intakes. is there a pump that has a regulator on it?

You were right the first post.
Much better/easier to put a control valve on your pumps return line.
You will not hurt a magnetically driven pump by restricting it`s outflow.
What most do, is a "T" on the return line, with a valve, inline to the sump, and an open line going back into the tank.
Any excess flow can be run thru your sump and the pump can run un-restricted.

 

[Bud8Fan]

Just throttle the discharge with a valve, you will increase the life of the pump and also reduce the electrical usage of the pump. If you use a T you will not reap these benifits.

 

[fox3]

How will you decrease electrical usage? By throttling the outflow all you are inducing is magnetic slippage, the pump might even run a percentage hotter doing this. It is basically a Constant Speed motor.

 

[Bud8Fan]

How will you decrease electrical usage? By throttling the outflow all you are inducing is magnetic slippage, the pump might even run a percentage hotter doing this. It is basically a Constant Speed motor.

The magnet is not slipping it is just doing less work. Read this thread as it has previosly been proved to those that don't understand how a centrifugal pump works.

http://www.monsterfishkeepers.com/forums/showthread.php?t=70671


One of the best pump makers "ReeFlo" even has this on their web page:

http://www.reeflopumps.com/flowbiasedpumps.html

Our pumps can be adjusted for use on all tank sizes from 40 gallons to 500 gallons by "valving down" the discharge. "Valving down" our pumps lowers the wattage and extends the life of the pump.

 

[Bud8Fan]

the pump might even run a percentage hotter doing this. QUOTE]

PS. It will actually run cooler as also shown in the thread I pointed out.

 

[fox3]

The magnet is not slipping it is just doing less work. Read this thread as it has previosly been proved to those that don't understand how a centrifugal pump works.

The magnetic drive is slipping. For those who don't know the difference between positive displacement pumps and magnetic drive pumps try stopping the flow on a PDP. Let me know how that works out for ya.

You can stop or restrict the output onna mag driven pump, it will not know the difference, it thinks it is experiencing more head. Completely restrict it and it will still spin along on its merry way none the wiser.

You can also divert excess flow back top the sump and accomplish the same results ... and... get the benefits of extra oxygenation of the water collumn ... a place to put an inline heater ... a place to put a UV ... or just another way to balance the system. Its all good.

You wanna discuss this it would be better to do this on the other link you posted and not hijack this thread. Discussion is good M8.

 

[Weaksrt]

i have a 6' head and the pump is 1000g @ 13' and i was thinking of a ball valve on the ends of my intakes. is there a pump that has a regulator on it?

Show me where u got Said Pump! I have a 225 and i need about 1100gph. Though my overflow is rated to 1000gph...