Description: One gallon of Formula 3000 will treat 125,000 gallons of well water with 1 ppm iron and hardness of 15 grains per gallon or more. It is made for use with extreme well water and for irrigation applications only. Formula 3000 is designed to treat extreme well water. It can handle extreme pH conditions and excessive hardness. As a rule of thumb, Formula 3000 will treat the problem.