Core & Main Hardness Standard as CaCO₃, 100 ppm, 1 LBy Core & Main $35.40 | EA Quantity discounts available QuantityPriceProduct #: 707038Mfr. Part #: HA7630-QThis item is in stock 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, 100 ppm, 1 L. Features 100 mg/L (ppm) as CaCO₃ DetailsBackDescription Hardness Standard as CaCO3, 100 ppm, 1 L. Features 100 mg/L (ppm) as CaCO₃