This dual purpose unit can be fitted on the cold water mains to prevent limescale forming from any heating appliance such as a boiler, shower, or cylinder. The CalCombi Mini induces a single polarity into the water preventing the build up of limescale as per the current Building Regulations. CalCombi Mini combination magnetic and electrolytic scale inhibitor WRAS approved. Connections: 22 - 15mm push fit stem adaptors Scale Prevention Mechanism = Electrolytic, Magnetic Connection = 22 mm Push-Fit Maximum Flow Rate = 1.08L/s Connection Size = 22mm Thread Standard or Connection Type = Push Fit