Save Money and Time 100% compatible includes all 5 filters + instructions and free tech support, extended service life, Contractor's Choice, 3/8" output 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 4th stage TFC-100 similar to MEM-90 standard size RO membrane designed to fit the same membrane housings Dimension: 1.75" diameter, 2" diameter with seal x 11.74" length, standard size Fits standard RO membrane housing canisters High quality membrane material supplied from USA manufacturer. 95% rejection rate, improved structure designed for greater efficiency and extended service life Consistent performance Replace every 3 to 5 years 5th stage Omnipure inline carbon filter is 2"x10" with coconut shell activated carbon for final polishing and improving taste of water. Dimension: 2" diameter and 10" length, standard size Inlet / outlet are 3/8" quick connect fitting Improves taste, remove odor Replace every 12 months