Hi
The overflow will match the pump rate. Two considerations to take into account; 1) if the flow is too slow you run the risk of air bubbles accumulating in the U-tube. Enough accumulation can break the siphon eventually. You can reduce this risk with a higher flow, if the water goes fast enough it will just push the bubbles through. The other consideration, 2) if the flow is too fast you can run the risk of it not being able to keep up. You can add another U-tube though to keep up.
HTH
__________________
-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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