RephiDuo P Pack S2 RR800CP01, replace Progard S2 PR0G0T0S2 RephiLe Catalog No.: RR800CP01Millipore Catalog No.: PR0G0T0S2 Product Description:  This product is designed to remove large particles and organic compounds, softening water, and remove chlorine from tap water to protect the RO membranes. Suitable for the following Millipore systems: Elix Advantage Elix Reference  Milli-Q Integral