The minimum flow is 3000 on a 4" pipe, now it depends on how much your flow rate your doing by the pump and also the size of the pre-filter to handle that needed flow. Don't forget the skimmer if tied into pre-filter. If your pond is larger then 5000 gals then you may want to consider a second drain which would up the flow to 6000 gph. I alway use a 4" pipe in case you want to up grade then its there. Hope it helps....................... 
1-1/2" = 350 gph
2" = 750 gph
3" = 1500 gph
4" = 3000 gph
Koiman™ CDKPA
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Koiman™
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Last edited by KDSD; 02-08-2008 at 06:55 AM.
Reason: should have been "minimum"
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