A kenmore 370 is THE CHEAPEST SOFTENER ON THE MARKET! IT IS NOT DESIGNED OR CAPABLE OF REMOVING IRON! If you have low water pressure i SUGGEST you throw that P.O.S to the curb and have a professional come and TEST your water and give you the results in writing!
Sears doesnt even make that softener they usell them with the KENMORE name stamped on it! They are so cheap WHY WOULD ANYBODY spend money to fix them! If you have a high amout of iron then you have destroyed the resin inside the tank and the softener is useless! I have never heard of anybody that would try to replace the resin on a cheap softener like a sears! IF you have high iron than you need a chlorine injection system (either pelletts or liquid chlorine) with a flow switch and with a 120 gal retention tank giving the water a chance to stay in contact with the chlorine so the iron can be oxidized then it needs to be filtered out.......with a carbon system (removes the iron and chlorine and in turn IS YOUR IRON FILTER......carbon needs replacement in 5yrs)10x54 tank with backwashing valve........then it needs to be softened VIA a new higher quality softener!
If you have a chlorinator with no backwashing Carbon filter than you have destroyed the resin in your softener! A SOFTENER only softens your water and cannot remove chlorine or high amounts of red water iron!