Flow rates

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Can anyone advise how fast water should flow over a DSB?
Also how many litres does a return pump need to pump as % of total water volume.
(how many times do you need to turn your total water volume,through your sump)
 
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Around 3 - 4 times would be just right.
 
Joined
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Is this the amount through your sump or through a DSB or both? assuming you have your DSB in your sump.
Was told you needed 5 to 10 times your total water volume through your sump,just wanted to verify.
I have a DSB in my main sump and another remote DSB.
 

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