I have a jet pump with a bladder tank. jet pump is new and tank is perhaps 30 years old. we had problems priming the tank originally, but was working fine for the last few months. Now sometimes when the pump is running it sounds as if air is being drawn in, and it takes a while for the pump to shut off. Not sure what this means. Also we naturally have a high concentration of iron in the water and since the occurance with the pump, there seems to be more iron in the water. Does this mean the line is sitting too low in the well? the well was completed about 1947.

thank you,