Flotech is made by Sta-Rite, It can be purchased at most farm stores or Menard type lumber yards. Most of the submersible pumps will last 10 years or more. If you are having a problem with the pump clogging up with something it will not matter much how good a pump you have it will clog up also.
A 120′ well is not that hard to pull. two men can do it easily with pipe wrenches. Use Sch 80 PVC with Sch 80 threaded couplings. Very easy to install back down the well, one pipe at a time 20′. Thousands installed across the USA. 1/2 hp 10 or 15 gpm pump.
Water Treatment Specialist