Different type of water purifiers are available in the market. We must purchase the product based on our requirement. Our requirement means quantity of water required for our family and quality of the water. Quality means its chemical parameters. If we are using well water sample, we must do a water analysis of the water. The testing must be done in a approved laboratory. Based on that we can ask the Water purifier companies to submit their techno commercial offer.Consider only established product. Cheap product are made from low quality plastic and filter membrane. So it will not give quality drinking water.