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231 Posts
It's pretty straightforward. Restrict the pump's output, and you're reducing the work the pump does, which results in less power draw and less wear - though the decreases will probably be within the margin of acceptable variability for something like a small mag drive pump.
Restrict the intake side, and you run the risk of causing cavitation, which can result in a huge reduction in the pump's reliability. This isn't a given with a restricted intake (it depends on the specific mechanics of the pump and the head on the output side) but it's a very real possibility.
Restrict the intake side, and you run the risk of causing cavitation, which can result in a huge reduction in the pump's reliability. This isn't a given with a restricted intake (it depends on the specific mechanics of the pump and the head on the output side) but it's a very real possibility.
