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Yeah... I suspect cavitation. I well water has a high iron content. The submersible pump becomes magnetized when running, which, in turn causes undisolved iron the water to adhere to the housing. ...

I recently increase the energize/de-energize setpoint on my submersible pump (my house has a well), from 20-40 PSIG to 30-50 PSIG. I then increased the expansion tank's charge to 28 PSIG. However,...