How to fix muddy water problem from a borewell?

I am from Odisha and have 4 inch 300 ft bore since 8 years. Now, I am having a problem that, when I start the motor at first 5 min clean water comes but after that muddy water comes for 10 to 15 minutes and then clean water comes again. My water level is at 130 ft and motor is at 90 ft. I have cleaned my bore by compressor but still the problem exist. How can I solve it?