A question asked a thousand times, I am sure. My Pentair 1.5 HP Challenger pump motor just failed. I've replaced the motor twice and the pump is quite old, so I am looking at another pump. My pool is 26,000 gallons, 1.5 inch piping, 1 skimmer, 1 drain, 2 returns, a Nature II and chlorinator in line The DE filter and pump are about 40 feet from the pool. The DE filter is large with a max flow of 125 GPM. I am looking at either a Hayward Super II or Hayward Super Pump at either 1 or 1.5 HP. With the Pentair Challenger 1.5 HP, I had to run the filter 8-9 hours to keep it clean. Thanks for any advice.