APEC Water Systems FILTER-SET-ES High Capacity Replacement Pre-Filter Set For Essence Series Reverse Osmosis Water Filter System Stage 1-3APEC 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