Unit 15 - 175 Litres of resin 15 - 175 Softener Capacity as CaCo³ 200ppm (m³) 3.7 - 43.7 Softener Capacity as CaCo³ 250ppm (m³) 3 - 35 Softener Capacity as CaCo³ 300ppm (m³) 2.5 - 29.1 Salt Consumption (kg/reg) 1.8 - 21 Flow rate - nominal (m³/hr) 0.6 - 4.5 Minimum metered 300 Litres / Hour