I read the write up of "Acidification to Remove Mineral Deposits" and was interested in the phosphoric acid idea. I recently started working at a 160 acre nursery and am in charge of a 16 year old irrigation system that I am having to teach myself on how it runs. On our home farm that is about 85 acres we run into heavy amounts of iron, about 15 ppm. We currently run a hypochlorite solution through the system but I am wondering if the phosphoric acid is the better way to go because of the benefits to the plants.Also where can I purchase this chemical. Sorry for the lengthy message. Any help is appreciated.