Our products An investment in a water softener is an investment in your entire home, and we understand how important your home is. TwinTec Cobalt The Cobalt is TwinTec’s latest 5th generation water softener with its improved design, eco-features and robust testing view the tt cobalt Water softeners The most advanced non-electric, block salt water softener ever made. Perfectly tailored to the UK market View the TwinTec S4 Salt Treat your home with softened water all day, every day. Salt