APEC Water Essence high capacity pre-filter set (FILTER-SET-ES) includes (1) sediment and (2) carbon block filters to protect and extend the life of the RO system. 1st Stage: 5 micron polypropylene sediment filter to remove dirt, particles, and rust 2nd 3rd Stage: 10 micron extruded carbon block filters to remove chlorine, taste odor High performance replacement filters are compatible with APEC reverse osmosis systems ROES-50, ROES-75, ROES-PH75, ROES-PHUV75, ROES-UV75, ROES-UV75-SS and all other standard sized under counter RO systems. APEC Water ESSENCE Series FILTER-SET-ES is for ROES-50, ROES--PH75, and ROES-UV75. Includes (1) sediment and (2) carbon block filters to protect and extend the life of the RO system 1st stage 5 micron Polypropylene sediment filter to remove dust, particles, and rust 2nd 3rd stage 10 micron extruded carbon block filters to remove chlorine, taste odor High performance replacement filters are compatible with all standard sized under counter RO systems