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Originally Posted by Wang
I believe the MCP350\DDC, MCP600\50Z, MCP650\D4 all use closed impellor designs(high head). Most aquarium mag pumps use open impellors(high flow).
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AC pumps use open impeller because they do not have a direction for rotation so they can not use curved blades.
With DC uni-direction pumps we can use curved blades on impeller and making them closed reduce attrition inside chamber increasing performance at all.
With open impeller power is lost by fluid attrition at volute (internal wall chamber).
I noticed that MCP350 / Laing uses closed impeller.