Murray, you have had a real expert answer this question, but you still seem to think you can solve this problem by listening to a salesman at Lowe's and continue looking for a cheap way to fix a complex problem. Gary Slusser has dealt with your kind of problem for years. He probably has forgotten more about the subject they most of us have ever heard of. The best advice I can offer is to contact him again and this time listen to him and take his advice. In the meantime, for God's sake, do put caustic chemicals into your water supply!