Sequence 750 series is making noise

[I just bought two brand new sequence 750 series (3600SEQ12) and installed them for my return and skimmer. After one month, My sequence (return) is making noise. I really don't know what causes this problem. Any help is highly appreciated.

Thanks
-D.]



Edited By hungtien on 1110604971
 
[Have you checking to make sure something is not in the volute? Could be small snail or something.

do you know were exactly the noise is coming from on the pump? What kind of noise?]
 
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