Several families in major Indian cities like Pune, Mumbai, Bengaluru, and Chennai rely on borewell water supplies. While this is typically safe to drink, it can contain several impurities. Moreover, as the wells go deeper and deeper, the water turns hard. The impurities include bacteria, viruses, lead, and fluoride. According to water quality institutions, you do not need purifiers unless there is metal contamination or a TDS of more than 200. You can get your water tested from any water testing laboratory in your area. Depending on the results, you can consider different types of purifiers. RO works best for water with TDS under 300 PPM. You can also use a gravity-based purifier if it doesn’t have significant contamination. However, if you ask us the top choice, we recommend an RO + UV purifier.