Stage 1- Activated Carbon : It absorbs suspended Particles, free Chlorine, Oil, Colour, Odour etc.
Stage 2- MnO2 with Anthrasite : It promotes the Activated Carbon and acts as a Catalytic oxidising agent and also converts the Iron in soluble ferrous (FeO) compounds into ferric (Fe2O3) form.
Stage 3- Multigrade Media : In this process Green Sand with Silica charged with KMnO4 and MnSO4 inactivating Bacteria and removing Iron and suspended Particles.
Stage 4- Qurtz : Making water Crystalline, Purifying
Stage 5– Gravels : Gravels increase the flow rate of water as well as the rate of Cooling and Purification.
Stage 6– Micro Strainer : It traps major Bacteria (higher than 0.4 micron) which are generally responsible for Diarrhea, Dysentery, Cholera, Typhoid etc.