I live in GA and have well water as the only water source to the house. We have lived in the house 23 years. Our well is 300 ft deep and has a submersible pump. We have always had a black gritty silt problem even with a whole house filter. I change the filter often but it can fill up in minutes at times. If the water is turned off it coughs up large ammounts of the stuff. The water is otherwise very clean with good taste. I had to replace the original pump just this week and I was hoping to be able to address the silt problem when the pump was pulled. Is there sometnimg I can do to filter out this gritty sand like black silt at the pump end? Or any other way to fix this? We've lived with it for a long time and I hate to shell out 1500$ and not be able to fix this problem.