0 psi on lower pump setting and 23 on highest pump setting

[otter86753]

I replaced my pressure gauge valve two months ago and thought the new gauge didn't register low enough (it was the only one my local plumbing store carried and I didn't notice until installed that it started registering at 20 psi) with a new one bought from TFTest. It registers 0 when I have the pump running at 1000 RPM and 23 when running at 3450 RPM. Any reason why this would be?

Thank you in advance.

 

[Richard320]

Normal operation. So get your baseline clean reading at high speed so you know when to backwash.

 

[otter86753]

Thank you.