Stats on our situation:
11,940 gal. Pebble Tech pool. New 1 hp Sta-Rite Dyna-Pro pump (we had this problem before the new pump was installed). The filter is a Sta-Rite high rate sand filter model hpb24, 3.1 sq. ft.. We had the sand changed out a couple years ago. We have a Hayward Pool Vac Ultra in the pool, too.

Next week, we have a service coming to change the way the filter discharges backwash water. The former home owner had it plumbed to drain into the common area of our subdivision which is a big no-no. They are going to put a regular hose in (I guess) so we can be legal and drain on our own property. I was hoping to figure out this plumbing thing before they come next week.

Thanks a lot!