I have a 20,000 gallon inground gunite pool. North Florida. We moved into the house 5 years ago. My pump (impeller) housing just cracked and was spraying water. It currently has a 1.5 HP Marathon motor. Im not sure what kind of impeller is on there now. I do not see a name on it. should I replace the whole pump including the motor. If so what should I be looking at. Size, type, brand, ect. There has to be a sweet spot between price and efficiency. What type of motor/ pump gives the best bang for the buck.