OK, I've been working on my pool for the last couple weeks in anticipation of the summer season.

I started out by cleaning the grids in my D.E. Filter (I actually had to replace two of them).

I then did all the normal stuff like adding enough bleach to shock and keep it at that level all the while filtering it.

When I added D.E. to the pool for the first time after cleaning it, my pressure was 10 PSI and on subsequent back washes after adding D.E. the pressure remained the same.

Until last night. We had some pretty bad wind and it was blowing all kinds of gunk into the pool. I was cleaning the skimmer baskets about every 15 minutes because the pump was cavitating.

Now this morning, I disover that my pressures (with clean D.E.) are at about 3 PSI. There are no debris in either skimmer nor in the hair basket. What could be causing the low pressures?

I might add that I just backwashed again and refilled with D.E. and my pressure are still very low.