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The motor and impeller are different for 50Hz vs 60Hz, you will have to replace the motor block and impeller for the unit to work properly on 220V/ 50Hz. This is likely the cause of the noise and starting issues.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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