I have just managed to get a bore well of 455 feet dug and had got water after 390 feet, and at 420 feet there was hardly 1 inch water. I installed 2 HP 25 stage submersible pump (CRI) at 430 feet. It is working fine for few hours (about 1 hour or so) and after that water filled with dust and dirt started coming and it stopped functioning. Starting after few minutes again its working for few minutes and then stopping after coming dusty water. We tried pulling the motor up and down, but still we are faced with the same problem. Any idea what can be the reason for this?