: This filter for an under sink reverse osmosis system is adaptive to RO system with no worries about leakage. : This filter for the reverse osmosis system has been tested and certified by NSF/ANSI 58 for TDS reduction and NSF/ANSI 372 certified for lead-free material. : Through reverse osmosis filtration, the filter for the RO system can effectively reduce TDS, chromium, pfas, fluoride, arsenic salt, iron, radium nitrate, calcium, chloride, radioactive substances and heavy metals like hexavalent chromium in your tap water according to testing by a third-party laboratory to improve your water taste. : It only takes a twist to replace the filter for the Waterdrop reverse osmosis system in three seconds with no tools required. : This filter for the tankless reverse osmosis system provides up to 24 months or 2,200 gallons of clean water, which may vary according to local water quality. Please note that it is recommended to apply this filter to WD-G3P800-W or WD-G3-W RO water filter system, otherwise, it may affect your use experience.