Core & Main Hardness Standard as CaCO3, 1000 ppm, 500 mLBy Core & Main $31.50 | EA Quantity discounts available QuantityPriceProduct #: 707039Mfr. Part #: HA7670-POut of Stock - Ships in 34 Days Quantity -+ Add to Cart Add to List Add to My List Or: Create a New List Create and Add Item Learn more about Core & Main chemicals and reagents for your everyday water quality testing.Free Ground Shipping On All Orders Over $1500!*Conditions Apply* Details Description Hardness Standard as CaCO3, 1000 ppm, 500 mL. Features 1000 mg/L (ppm) as CaCO₃ DetailsBackDescription Hardness Standard as CaCO3, 1000 ppm, 500 mL. Features 1000 mg/L (ppm) as CaCO₃ Documents Safety Data Sheet