I have a lots of submersible ...

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I have a lots of submersible pump which be 0.75, 1.5, 3.75, 5.5, 7.5 kW and using in waste water treatment (heavy duty works). And I always fix them but after fixing they run smoothly only 3 months. you can test only coil, Flow, Pressure which be link with head and performance of the pump and leak in term of electric. Finally we buy the new pump is the best way and for the fixed pump we use for spare.