Low pressure in filter?

[Poconos]

If the pool guy thinks 40 psi is OK then I'd change pool guys. The system isn't sized properly. Could be small piping, small filter, way oversized pump, or anything in the return side that is limiting the flow. I don't know anything about DE filters other than what I've learned from this forum but if we assume the filter is the restriction causing high pressure what if a grid broke and you're just bypassing the filter media? Also, what about the pressure during backwash. Did that change?
Al

[mkelley]

This system is *exactly* the same as three others in this development (including initial pressure readings) so for the moment I'll assume it was set up properly and either folks here don't have experience with this kind of system (and therefore can't help me) or just don't get it.

Since nothing else is working incorrectly except for the gauge pressure drop I guess I'm not going to worry about this further. But thanks for the replies.