I agree with CarlD. I have an uprated 1.5 HP pump with my cartridge filtler which are both oversized for my 6600 gal pool and 300 gal spa but I have several water feature and the spa jets that need to be powered by it which is the reason my contractor went with them. I also have a sperartely plumed uprated 1 hp pump for the fiberoptics lighted water features (yeah, I just LOVE waterfalls and deck jets--call me a big kid!) that has an intake in the pool a bit below water level and an outlet that can be used for a pressure side cleaner instead of a booster pump just by turning the valve to shut off the water features and direct all the flow to the outlet. The point is my contractor oversized the filter to match the pump size I needed for the setup and it works like a dream.
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