Pool and Spa
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Is the pump a 2 speed or variable speed? I need to know the SF number on the pump motor to determine the true horsepower. The DE Filter only requires 2 gpm per sq. ft. of filter area. Not only will the filter pressure go up quickly but a too large pump will also "bag the grids" or damage the cartridges. Be sure you have the correct amount of media (DE or Fiber) as not having that in the filter will also cause the pressure to rise that quick.
I just saw this without my answer I placed the other day.. I am so sorry for the delay. I don't know what happened. However 1.65 HP is very high for a DE Filter. I need to know the model of the filter so I can tell what the filter area is and calculate the gallons of flow it can handle as well as calculate the DE amount to be sure it is enough.