The IV model is equipped with a semi-automatic IV valve in thermoplastic material, and with quick coupling water connections, allowing easy and rapid installation. Resin regeneration occurs by manually rotating the valve knob in the following four positions:
- Pressure relief and salt-loading
- Resin rinsing
Water usage by the machines connected to the water softener is possible also during regeneration. Moreover a mixer inside the valve directs part of the hard water towards the outlet, hard water is then mixed with soft water to deliver water with a degree of hardness. To obtain totally softened water, users only need to close the mixer completely.