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Unread 04-14-2004, 07:41 PM   #9
Butcher
Thermophile
 
Join Date: May 2001
Location: UK
Posts: 1,064
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The physics is that 1000 gph is with no head loss (i.e. just open flow), a real system has anything from about 2 to 6 feet of head loss, which puts most of these "1000 gph" pumps down at nearer to 100 gph.
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