The Everpure Claris Carbonate Hardness Test Kit determines the total carbonate hardness in a water supply. This is useful in a variety of circumstances, for example when installing a new Everpure Claris or Claris Ultra Filter System, or when installing or preparing to purchase a water softener. Setting up a new system of any kind designed to deal with hardness requires a baseline measurement of hardness. Add this kit to your basket and get the information you need!