Try taking apart the front housing where the impeller is. Its possible something is messed up in there. Iwaki gives schematics and such so I'm pretty sure its safe to take it apart.
there should be enough back pressure in ur system to make it so there is no cavitation. im runnning the WMD-20 and there is no cavitation in my sytem and i got equvialent components running.
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Excuse me, I believe you have my stapler.
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