Quick Definition:

A hardness reagent is often found in swimming pool test kits and mixed into the pads found on test strips, and is used in testing the hardness of swimming pool water.

What is a swimming pool Hardness Reagent?

hardness reagent is a compound used for water quality maintenance, where the reagent stabilizes the water hardness in water samples used for testing.  There are calcium hardness reagents and magnesium hardness reagents, where the calcium hardness reagent is used in testing calcium hardness, and the magnesium hardness reagent is used in magnesium hardness level tests.

For swimming pool owners, they will encounter hardness reagents in test kits designed to test water hardness, and as test strips that test for pool water hardness.  In testing the calcium hardness level in swimming pools using the titration method commonly found in test kits, a hardness reagent is added drop-by-drop after adding a calcium buffer reagent and a calcium indicator reagent.  The number of calcium hardness reagent drops added to the mixture is used to estimate the calcium hardness level in the pool.


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