Use the same kit the pro's use with the Spectrum Hardness, Iron & pH test kit that replaced P/N 2401. Spectrum provides the best water conditioning demonstration test kits in the business. All of the Spectrum solutions are blended in house and are proprietary to the brand. The test kit case is made of heavy plastic and are strong enough to pass a two story drop test. This kit contains the necessary materials to conduct three types of tests: iron content, pH level and hardness of your water. Easy to follow instructions are included with step-by-step direction.