Anyone had any success in just replacing the bearings on the motor rather thanbuying a new motor?

I have gone through 3 motors and now looks like I need a 4th. Are the pump seals no good anymore? I know people that have had the same pump and motor for years and no problems.

What am I doing wrong here? Have a Hayward pump presently, but have had the same issues with a sta-rite pump as well. This is an inground pool and the chemicals used are those that are suggested here. Bleach and Borax.

Are these eating up the pump seal causing the bearings to go out on the motors?

HELP HELP!