Higher Storage, Large RO Membrane, Water Purifier with a Pre - Filter, Unique Mineral Enrichment System (MES). Its Unique Mineral Enrichment System adds back the essential natural minerals back to your water, which is lost in the filtration process. The most trustworthy health-shield RO membrane works till 2500 ppm of TDS (Total Dissolved Solids). Its strong filtration is effective even in areas with extremely hard water. Removes all physical impurities, enhancing the life of the RO membrane. 7 stages of purification help remove not only the physical impurities but also the microbial & chemical impurities. Most Filters in Whirlpool purifier are sealed with spin welding and hence cannot be tampered with.