The ISG® Deionizers have been designed to be an effective low cost method of producing 1-10uS/cm purified water at low volumes. These simple units incorporate an easy to replace cartridge, containing specifically designed resin which changes colour through absorption of contaminating ions. This allows for easy identification of when each cartridge needs to be changed. When the colour changes from blue to brown it is then time to change the cartridge. Units are wall mounted and work directly off the mains water supply. This is the 30 litre per hour version. Comes with 2 cartridges. Max feed pressure (Bar) - 0.5 – 5. Max feed flow rate (l/hr) – 30. Output capacity, litres: 50mg/l tds (soft) – 640, 200mg/l tds (medium-hard) – 160, 300mg/l tds (hard) – 106, pH – Neutral, Conductivity – 1-10uS/cm, Dimensions: 80mm x 100mm x 580mm, Weight: 2.8kg, Installation Requirements, Feed Water – Portable, Maximum TDS - 1000ppm, Feed Water Temperature - 1 - 35°C.