Description: One gallon of Formula 1000 will treat 125,000 gallons of well water with 1 ppm iron and a pH of 6.0 or less. It is made for use with acidic (low pH) well water and for irrigation applications only. Formula 1000 is at least 2.5 times stronger than an “equivalent” product sold by a national mass merchandiser! Further, it will do the job in low pH applications!