Core & Main Hardness Standard as CaCO3, 100 ppm, 500 mLBy Core & Main $27.95 | EA Quantity discounts available QuantityPrice1 – 1$27.952 – 5$27.256 +$26.55 Product #: 707037Mfr. Part #: HA7630-POut of Stock - Ships in 49 Days Quantity -+ Add to Cart 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