Core & Main Hardness Standard as CaCO3, 100 ppm, 500 mLBy Core & Main $26.35 | EA Quantity discounts available QuantityPrice1 – 1$26.352 – 5$25.696 +$25.03Product #: 707037Mfr. Part #: HA7630-POut of Stock - Ships in 49 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, 100 ppm, 500 mL. Features 100 mg/L (ppm) as CaCO₃ DetailsBackDescription Hardness Standard as CaCO3, 100 ppm, 500 mL. Features 100 mg/L (ppm) as CaCO₃ Documents Safety Data Sheet