The First stage filter blocks these impurities down to a maximum of 5 microns. Chemicals including Chlorine, Potassium permanganate, Aluminium sulphate and over 30 other chemicals are widely used in our water supply for numerous reasons including disinfection, pH correction and corrosion control. While they are needed on a large scale to stop bacteria growth, when the water reaches your home it rarely sits stagnant and has a considerably small travel to reach your taps. This enables us to remove the harsh chemicals as they are no longer needed and have proven to be quite harmful to our health.