Compatible APEC FILTER-SET bottom 3 filters for model ROES-50, ROES-75, RO-45, RO-90, RO-PH90, RO-PERM, RO-PUMP, RO-Hi, WFS-1000, ROES-UV75, ROES-PH75, ROES-PHUV75, ROES-UV75-SS includes 1 sediment filter and 2 carbon block filters. 1st stage: Multi-layer 5 micron Sediment filter for more dirt holding capacity and extended service life. Dimension 2.5” diameter, 9.84” length” , standard size Fits standard 10” filter housing canister Made with Pure Polypropylene, no BPA Conform toe ISO 9001:2000 Manufacturing standard Removes sediment, dirt, sand, rust Replace every 12 months 2nd & 3rd stage: Activated coconut shell carbon block for extra capacity 5 micron rating 6,000 gallons chlorine reduction capacity or 2,000 gallons RO water usage capacity Dimension 2.75” diameter, 9.84” length Activated carbon block filter made with 100% high quality coconut shell carbon. Removes sediment, chlorine, chloramines, taste, odor, THM, VOC, Pesticide, Herbicide, turbidity Replace every 12 to 18 months