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I found these instructions online http://www.aquariumlife.net/projects/diy-overflow/120.asp for a DIY PVC overflow. I constructed mine exactly as per the instructions (except my PVC is 20mm instead of 3/4"), and it works.

However, the flow rate is FAR too low for the 3000LPH (~800GPH) pump I bought.

So my question is, what would anyone recommend I do to increase the flow rate to the sump?
Larger diameter piping, multiple overflows, a different design or all of the above? (or anything I haven't thought of)

Cheers
 

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Larger diameter piping.
 

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x2. Bigger holes or more holes, you get a bigger bang by making the hole bigger. Unless you have a requirement we don't know about, like the 20mm is the largest you can fit through the hood or something.

Jeff
 
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