RAINSOFT IRON FILTER

I realize you are a newbie, but I am afraid you won't get many responses without more detail.
What are you talking about? Gives us info on type of equipment (model, size, age, ect.), your water quality (both source and treated), symptoms that indicate it is not working, other, additional equipment.

Good luck
Andy

Is it a manganese green sand filter that back washes with potassium permanganate?