Alliance provides you water purifiers with latest water purification technologies like Reverse osmosis (RO) and ultra violet (UV) Purification.By using these technologies we help you to remove impurities including colour, odour, taste, hardness, virus, bacteria etc. For this we use five stage filtration.The five stages are sediment filtration,micron filtration, pre-carbon filtration, RO membrane filtration,post-carbon filtration respectively.sediment filter will remove all impurities than can be seen by our naked eye. thus the water becomes clear (visually) and increases the life of other filters.the life expectency of this filter is till the water flow decreases.the very next stage is micron filtration which is used to remove the tiny impure particles.its life expectency is one year. next is pre-carbon filtration, it is used to remove odour, chemical fertilisers in the soil, oil content and all poisonous materials.then RO membrane which is the microporous filter(0.0001 micron).it removes hardness, virus, bacteria and wash out with waste water through an outlet ( It's maximum output ranges from 50 to 60%). So it's life elongates and it will be upto 1 year. The final stage is post-carbon filter . It gives the water a natural taste. It's life extent up to 1 year.