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post #38 of (permalink) Old 07-15-2009, 03:04 AM
Planted Tank Guru
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Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,673
The type of pumps we use can run for hours with the outlet mostly blocked, but if you block the inlet more than slightly, the pump will cavitate and destroy itself eventually. This means you do any flow regulating downstream of the pump, never upstream.

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