Its a sand filter. I did read about the DE test and was going to give it a try.
Pressure gage was definitely increasing in the beginning and I was backwashing quite a bit. BUT I haven't backwashed in about 4 or 5 days and no the pressure hasn't gone up much at all. It starts around 11 and never really gets higher than 18 or 19.

I shut the filter off tonight around 6 PM. I am interested to see if that makes any difference tomorrow morning

P.S. How can I use a little DE to help with a sand filter?