The Aquatiere Pureau combined no salt water softener and drinking water filter provides the best alternative to traditional salt based water softeners. The Pureau Range has been specifically designed to meet the demands of providing a water softener without the use of salt that provides softer water to the touch. Instead the range uses traditional ion exchange resins to produce superb, soft water for household or commercial use. Pureau water treatment systems remove a high percentage of scale forming minerals. Water readings of under 100ppm is considered soft. Magnesium and calcium in the water is essential for good health so Pureau systems do not remove it all, just enough to bring it down to accepted soft water levels. The 3 models (Eau 1, Eau 2 and Eau 3) range from 20 litres per.