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#2
04-26-2007, 03:17 AM
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think need two overflows?
__________________
 Spent the rent on fish
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#3
04-26-2007, 03:18 AM
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I have a 600gph overflow being pushed back by a MJ 1200 to about 4' head - never a problem. The overflow will adjust to the speed of the return
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#4
04-26-2007, 03:34 AM
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A second overflow box would provide extra insurance, in case the siphon breaks on the other box, but I don't think this is very common if the overflow is designed/set-up properly.
If the noise from your overflow gets too loud, you can set up a Durso standpipe (http://www.dursostandpipes.com/). Last edited by bsyoun; 04-26-2007 at 03:37 AM.
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#5
04-26-2007, 03:30 AM
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Should find a pump factoring in head loss that will match to your overflow or the flow you're aiming for (eg pump rating - head loss = overflow rating). Unless you have plans for teeing off the return for some other function (Ca reactor, phosban reactor or such) you're really just buying a bigger pump for nothing.
If planning on relying on the return pump for circulation only, 600 gph on a 100g not that much turn over. If the return pump is only to cycle water through the sump and have powerheads, streams or a closed loop for display, 600gph should be enough. Haven't played with hang on overflows but would imagine more you push through them, noisier they may be. Should be using a ball valve and unions though to allow to remove pump for maintanence or repair if pump's to be external.
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