Unit 75 - 300 Litres of resin 75 - 300 Softener Capacity as CaCo³ 200ppm (m³) 18.7m³ - 75m³ Softener Capacity as CaCo³ 250ppm (m³) 15m³ - 60m³ Softener Capacity as CaCo³ 300ppm (m³) 12.5m³ - 50m³ Salt Consumption (kg/reg) 9 - 36 Nominal feed (Lph) 2.6 - 4.1 Minimum metered 60 - 160 Total water used during regeneration (litres) 420 - 1800