APEC Water Systems FILTER-SET-ESX2 2 Sets of High Capacity Replacement Pre-Filter Sets For Essence Series Reverse Osmosis Water Filter System Stage 1-3 APEC Essence standard capacity 10 inch reverse osmosis pre-filter replacement cartridges Includes (2) sediment and (4) 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 Compatible with APEC ROES-50, ROES-75, ROES-PH75, ROES-UV75 and most industry standard sized 10x2.5 filter housing