To me it looks like you are 100% right!
as all I need it pressure, and not that much flow, i could play a bit with the opening in the closed impellor. Start small, and then open it untill it's to much for the pump to handle.
Can you hear it if the motor stops spinning?
On the otherhand, I can not make my impellor bigger, so just a plate might do the trick. My pump can now get about 1.5 meters, at 700l flow (I have 2 of them in series) what would the max benefit be? Or should I just buy me 2 MCP600......
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If it get's hot, it needs to be watercooled!
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