Hach Hardness Solution, 20 gpg (340 mg/L)/2 mg/L Iron, 500 mL, 47949By Hach $92.70 | EA Quantity discounts available QuantityPrice Product #: 700659Mfr. Part #: 47949 This item is in stock Quantity -+ Add to Cart Free Ground Shipping On All Orders Over $1500!*Conditions Apply* Details Description 20 gpg (340 mg/L) hardness, plus 2 mg/L iron as Fe (Hard water). Product Specifications Concentra... DetailsBackDescription 20 gpg (340 mg/L) hardness, plus 2 mg/L iron as Fe (Hard water). Product Specifications Concentrations 20 gpg (340 mg/L) Description Hardness as CaCO3 (NIST), also see Calcium Platform Solution California residents see Prop 65 WARNINGS