APEC Water ESSENCE series FILTER-SET-ESPH is for ROES-PH75
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 inch high purity premium made ph+ calcium carbonate alkaline inline filters with quick connect
APEC's extruded solid carbon block filters far surpass gac filters in performance and absorptive capacity; in addition they DO not leak carbon fines