APEC Essence high capacity pre-filter set for ROES-PH75 is made with high quality filtration components to protect and prolong the lifespan of your reverse osmosis system. Premium quality filter set lasts over 6 to 12 months for high performance contaminant removal. These standard size filters are compatible with APEC Essence Series and all other 10" standard size under counter reverse osmosis systems APEC Essence high capacity 10" pre-filter replacement with FI-PHPLUS-QC alkaline calcite filter 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 6th stage 10" high purity pH+ calcium carbonate re-mineralization inline filters w/ quick connect High performance replacement filters are compatible with all standard sized under counter RO systems