Hi, I have a 15x24 oval above ground pool. It has about 9000 gallons of water. I would like to replacement my StaRite 1 1/2 HP pump with a 1 HP pump. I would like to know if that is sufficient. I am trying to save on electric cost. It seems like when I replace my 24' round ag pool that had a 1Hp my electric cost went sky high. I have a 200 lb sand filter.