Product Description This is a replacement filter cartridge for theHydrotech Pura Quick-Change SystemFeatures:Purpose: TDS ReductionRecovery (Product/Inlet Water: 21%TDS Reduction: 85%Rating: 50 Gallons/DayRated Life*: 36 MonthsStage: 3* The performance and life of a reverse osmosis membrane or filter element is highly dependent upon pressure, temperature and dissolved solids (TDS).The PURA Quick-Change reverse osmosis membrane reduced dissolved substances and inorganic contaminants like arsenic and chromium. The innovative PURA twist and lock design makes service simple. Twist off the old cartridge and twist on the new. No messy sump removal. PURA makes drinking water better and life easier.The rated life of this cartridge is 36 months.Warning: This drinking water system is for use on potable water supplies only. Source water exceeding chemical parameters requires pre-treatment****.Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system.Do not place module where it will be exposed to freezing and/or direct sunlight. Module must be easily removable for performance of routine maintenance.Turn off water supply to the head without cartridge if it must be left unattended for an extended period of time. For use as standalone or Stage 3 Module in AquaFlo Platinum QCRO and QCUF systems.**** Refer to inlet water condition guidelines in the user manual*** Manufacturer's Specifications only with inlet conditions of 345KPa(50pslg), 25°C (77°F) going to atmosphere. The actual volume of product water and rejection percentage will vary with differences from the test conditions that membrane ratings are tested upon.** The performance of reverse osmosis membrane si highly dependent upon pressure, temperature and TDS.(1) Pressure Regulator is recommended for feed water pressures exceeding 552 KPa (80pslg).