I have a 10,000 gal inground gunite pool, attached overflow spa, 100 st ft Hayward cartridge filter, 2” pvc throughout, 2.0 hp 2 speed pump motor. I feel that the large size of this pump is not only inefficient but also contributing to poor filtration.

Without going into a long winded story, I am unhappy with the quality of the filtration in my pool. I have spent many $$$ replacing cartridges ever 6 months, and even tried adding some synthetic DE to the filter. All with little or no effect.

Am I correct in assuming too large a pump motor in a cartridge system can cause the filter pores to widen and thus decrease the filtering efficiency? If so, I guess I’ll be looking for a new pump. If that’s the case, what size would I need, 2 speed preferred. Are there any brands or models that would be better than the rest or any I should steer clear of?

Thanks