The ground water that comes into my sump pump pit has a lot of iron in it. Over a period of six months to a year the 1.5 inch evacuation line builds up enough iron to close the line down to about a half in diameter. I have to take the whole system apart and clean out the line twice a year and replace the pump about every other year. Is there a cure for this problem. I have lived in the house 23 years and it drives me crazy. Thank you very much.