APEC Water Systems FILTER-SET-ESX2 2 Sets of High Capacity Replacement Pre-Filter Sets For Essence Series Reverse Osmosis Water Filter System Stage 1-3High capacity 10 inch replacement filters for reverse osmosis systems Includes (2) sediment and (4) Carbon block filters to protect and extend the life of the RO system 1st stage polypropylene sediment filter to remove dust, particles, and rust 2nd & 3rd stage extruded carbon block filters to remove chlorine, taste & odor Compatible with APEC ROES 50, ROES 75, ROES PH75, ROES PHUV75, ROES UV75, ROES UV75 SS and all other standard size under counter