I have a plaster pool (25Kgallons) over 15 years old with original pump. Pump is Hayward Super Pump SP-1615-21-M MODEL #C48M2N111. The pump motor has been getting noisier and now I am noticing a significant drop off in suction at my skimmer, which is furthest away from the pump. I am considering replacing the pump and motor. We currently have the house listed for sale. Should I replace in kind?