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Hanna Instruments Canada
Customer Support: (800) 842-6629

Calcium Hardness Checker® HC Reagents (25 Tests) - HI720-25


In stock

The HI720-25 are the replacement reagents for the HI720 Calcium Hardness Checker® HC. These high-quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each packet for traceability.

  • Pre-made reagents for ease of use
  • Prepared with high purity chemicals
  • Marked with expiration date and lot number for traceability


The HI720-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Calcium Hardness Checker® HC. These reagents follow the Calmagite method in which the reaction between calcium and the reagent causes a violet tint in the sample. When the HI720-25 reagents are added to the sample, the reaction will take place and the HI720 will determine the concentration from the color that is produced. The results will be displayed in ppm of calcium hardness as CaCO3. These reagents are designed to be used with samples that have an expected range of 0.00 to 2.70 ppm CaCO3.

Additional information

Weight 0.14 kg

Calcium, Hardness


SKU HI720-25
Name Calcium Hardness Checker® HC Reagents (25 Tests) – HI720-25
Package Packets
Quantity 25
Method adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, Calmagite method. The reaction between calcium and reagents causes a reddish-violet tint in the sample.


Calcium Hardness Checker® HC Reagents (25 Tests) – HI720-25