how to match over flow with pump

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E

eyft23

Gambusia
MFK Member
Dec 2, 2007
222
0
16
on a rock
hi, i am a newb trying to figure out which is more important. should the pump gph be mor ethan the over flow rate? i mean if my pump turns over 1015 gph and my overflow is rated at 600 gph is there going to be a problem? or should the overflow rate be higher than the pump gph.
i am going to make my own overflow from one of the other threads and the overflow is rated about 600 gph, i just want to find a pump that will keep up and not fall behind. could someone help me out. thanks.
 
The overflow should be able to handle more than the output of the pump. Otherise you run the risk of the overflow not keeping up.
 
to match up a pump with overflow, you need to get a few facts figured out, reefcentral has calculator for this, but what u need to know is the height from sump to top of tank, head height, then look on chart for the pump of your choosing, the pump flow rate should be just smaller than the flow rate of your overflow, that is the short answer hope it helps you some. if you want to be more exact you need to know how many turns your pipe has, how big the pipes are, how long pipes are, and various other things that helps with calculatins of flow rates from pumps!!!!!!
 
why don't you attach valves on either end so you cantrol your overflow and pump output? Thats what i do and it can take only a few min of tinkering to match them up
 
Controlling the overflow is a bad idea. It should always run wide open and unrestricted.

Controlling the output of the pump on the other hand is a good idea.
 
this is how fast pvc will drain

Stand pipe Size Gravity Flow Rating
3/4" 330 gph
1" 600 gph
1 1/4" 910 gph
1 1/2" 1300 gph
1 3/4" 1800 gph
2" 2350 gph
2 1/4" 2960 gph
2 1/2" 3650 gph
2 3/4" 4450 gph
3" 5280 gph
 
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