Purchasing a reverse osmosis (RO) water purifier requires careful consideration beyond just the initial price. While a unit may cost around ₹14,999, the total cost of ownership can exceed ₹50,000 over eight years due to ongoing expenses like filter replacements, technician visits, and maintenance contracts. One common mistake is relying solely on Total Dissolved Solids (TDS) readings, which do not indicate the presence of harmful contaminants. Consumers should also be wary of blending mechanisms that can compromise water quality. It's essential to evaluate the long-term cost of ownership, which includes maintenance and service dependencies, rather than simply opting for the cheapest upfront price. Additionally, while brand familiarity offers some reassurance, newer brands may provide superior product designs and warranties that cover essential components. Buyers should prioritize products with comprehensive warranties and smart features that monitor filter health to ensure reliable performance over time. Ultimately, the goal is to select a purifier that guarantees safe drinking water throughout its lifespan, rather than one that incurs hidden costs after purchase.