f3922471_ater_Standards_and_Definitions__AGENT
[ACCEPTABLE or SAFE LIMITS] Less than 0.3 mg/L [SOURCES] Natural deposits Over 25% of Earth’s crust is iron, so it is naturally one of most common reasons for water treatment Iron manifests itself in two forms: Ferric Iron (suspended solid, visible in water) and Ferrous Iron (dissolved solid, colorless until exposed to air) [EFFECTS] Water may appear colored, ranging from light yellow to bright orange Stains fixtures and/or clothes Can impart unpleasant taste, often bitter or metallic in taste Will build up in plumbing, sometimes to the point of completely blocking pipes [AGENT] 
Iron
Haskell Water Treatment Drinking Water Standards and Definitions
AGENT