Thanks. I consider about 10 psi normal, because that's what it's always read after a backwash for the past 3 years. There is also a 'Clean' indicator on the readout that points to 10 psi. But mainly it's the history that leads me to believe less than 10 is low.

I have a waterfall and a bubbler and as near as I can tell they are operating at a normal flow rate (the bubbler is fountaining about as high as it usually does).

I put in the requisite amount of DE after the backwash (6lbs) and the filter blades looked in good shape when I did the spring cleaning this year. But I suppose there could be a problem there.

There isn't any water around the pump area, everything is dry.

The pump did run dry once last season (from now on, I turn off the system when I go out of town).

Thanks again!