12 year old iron filter rebedded two years ago. New pump this year to improve pressure/GPM/aeration/backwash. Don't recall the numbers from the water tests but lots of iron. A pail of unfiltered water left overnight looks like I mopped up a slaughterhouse. Water let to sit after filtration stays clear yet get iron stains on the grout. RO pre-filters discolour. Using RO water in my coffeemaker, there is a stained high water mark. My water guy says it can only do so much.