Aquasonic Hardness Test Kit (Fresh Water)

This HARDNESS TEST KIT measures the sum of the calcium and magnesium concentrations in a fresh water sample, expressed in ppm (parts per million). This is, in essence, measurement of the permanent hardness of water, but the measurement may also contain some temporary hardness in the form of calcium dissolved by carbon dioxide in water. This form of temporary hardness is usually minimal.

Use it to check the hardness of the water you put into your espresso machine or coffee brewer, and to help choose the right water filtration or treatment for your setup.

HOW DOES WATER BECOME HARD?
Water hardness results from dissolved compounds of magnesium and calcium.
With temporary hardness, magnesium and calcium are dissolved by carbon dioxide in water. This process can be reversed by removing the carbon dioxide, e.g. by boiling. However, if the salts of magnesium or calcium are dissolved as a result of an acid present in water, the hardness becomes permanent.

WATER HARDNESS IN THE NATURAL STATE
The degree of hardness varies not only from country to country but river to river and even the hardness in each river varies from season to season.