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Originally Posted by IceMan  why? what does it matter how much flow is in the sump? the more water by more liverock the better, and higher flow would churn more so the skimmer will pickup more... |
You want the flow through the sump to be slow enough to allow particulate matter to settle in the sump for siphoning later on. A rule of thumb I've read about is to match the flow through the sump with the flow through your skimmer.