Calcium Hardness Test Kit

Measurement of Calcium Hardness in your spa, as opposed to the Total Hardness,  is essential when using copper-based sanitizers such as PristineBlue.

This simple to use test kit is far more accurate than test strips which usually only measure the Total Hardness.

Testing should be carried out at every water change and monthly thereafter. To use the kit simply fill the test tube with 10ml of spa water and add drops of the reagent noting how many drops are required to change the water colour from red to dark blue. The number of drops determines the Calcium Hardness of your spa water.

For PristineBlue based sanitation the reading should be 120-250 ppm. Lower values than 120ppm may result in corrosion of equipment and staining.

Artificially softened water that has a very low Calcium Hardness should never be used in a spa.