Muddy water coming out of borewell.

Borewell discharging muddy water

Hi, i am arvind Recently a borewell is dug into my house in raebareli, U.P. Borewell is about 145 feets deep and submersible pump is lowered to depth of 100 feets, after complete installation , when the pump was started it was discharging muddy water , the mechanic told us that water will get clean into 2- 3 days, but it's been about 10 days or more but the water is same as it was before ( muddy ) actually when the pump is run for 2-3 hours continuously the water becomes clean but on the next day when the motor is turn on the water is again muddy, for your information where the borewell is dug it's still not cemented...please help me..