If you really want to remove iron,
Potassium permanganate is about the best there is. Sears used to sell it as their iron remover for domestic water systems. A chlorine blending tank with a sand filter, then a charcoal filter was another option. https://en.wikipedia.org/wiki/Potassium_permanganate
Other than reallocating the sprinklers heads and adjusting them by preventing the water from hitting the home and concrete helps greatly. At least for S. Florida, Home Depot and Sears sold a product to "prevent" the iron from oxidizing. At least for Sears, where I worked for a time, it was a local product. Home Depot also had the similar product and again, may have been a local product.
During the housing boom of the 60's to the 80's's in Florida, wells for irrigation were usually around 40 feet deep. You knew a home had an irrigation well by all of the iron stains everywhere, even on cars that got over spray.
I cannot remember the product name but it was sold in concentrate liquid in one gallon jugs. Bought separately a plastic tank of about 30 gallons. A hose from the tank to the suction side of the pump was connected to the pipe with a special fitting. For each gallon of solution you put into the storage tank you added about 5 gallon of water. When the irrigation pump turned on it would draw the solution into the pump where it was further diluted. I have to say Sears sold a ton of it until Home Depot started to sell the same product under a different name. However, HD product was less concentrate and you only added 3 gallons of water.
It sold extremely well because the HOA's would demand the iron stains to be cleaned up and there was a iron stain remover sold, even today Home Depot sells the stain remover but not the iron stain preventor. You'll still see iron stain homes in the older developments in Florida
It all faded away because the well drillers started to drill to around 70 feet where the water changed to sulfur water. You will never get iron stains from sulfur water, it sure stinks but it kept the kids away.