the MCP600 has a closed impeller per the 'high head type' shown in the Iwaki dwgs
- and that is why it is 'better' (for WCing applications)
understand that cheap AC motors can, and will, start and rotate in either direction
this is why aquarium pumps have straight vanes, reducing their efficiency even more
you will not have any 'luck' converting an open impeller to a closed one
no free lunch
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