OK, the picture helped a lot. All the 50/60 Hz means is that it'll run fine on either. Speed says 2000/2500 rpm for 50/60 Hz.
Pump head is proportional to rpm^2, so for a given flow rate you'd only have about 65% of the head available running on 50 Hz vs 60 Hz. Translation: For a given resistance (given WC system), your flow will drop to the tune of the 10-20% that airspirit noted above.
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