I live in a house that is 25 years old. In the last 2 years the smell that we get when we turn on the water is foul. Some time it smell like rotten eggs other time it smell like it would have oil mixed in it. I do have a black light and filter in line. When I change the filter there are pice of metal on the bottom. Do I need to have another weel drill or is there something I can do. Can't afford to drill well, both wife and I are on disabilty. If any one can give me some ideas to try, Thank you in advance.