I have installed this product at my cottage where we have a well which contains quite a concentration of iron. at first when I got my NSC40UDI to regenerate my water (following) the regeneration was like rusty... quite understandable when it does it's backwash and rince with rusty water. I then installed a clearwater filter between the water line and the NSC40UDI which I only use when regenerating the softener otherwise this filter is set on the bypass mode. The result is WOW! I finally got some nice clean water with no color, no smell.