Set of 3 compatible Replacement filters cartridges. Stage 1- Sediment cartridge is the first filter installed in the Avantapure RO-450 Reverse Osmosis filters systeme . The main function of a sediment filter is to remove large and fine particles from a drinking water, such as sand, dirt, silt, and rust particles. Removal of such particles allows for a better performance of all the following filters, such as Carbon Block or GAC filters. Micron rating: 5 Micron. Dimensions: 9.75" x 2.5" Lifetime: Replace every year, depending on the water quality. This GE Pro Elite RO-450 Filter is wrapped and sealed and meets NSF Standards and Regulations. Filter will fit any Residential Reverse Osmosis Unit that features standard 10” filter housing For GE Pro Elite RO-450 Revers osmosis water filters Stage 2- Activated Carbon Block Filter are made of fine coconut shell carbon remove odors and tastes of many organic compounds, chlorine especially. Though, because this filters are made of a packed carbon (forming a cylinder block), they offer a much finer filtration of suspended particles and dirt. Micron rating: 5 Micron. Dimensions: 9.75" x 2.5" Dimensions: 9.75" x 2.5" Lifetime: Replace every year, depending on the water quality. This filter is wrapped and sealed and meets NSF Standards and Regulations. Filter will fit any Residential Reverse Osmosis Unit that features standard 10” filter housing Stage 3- Reverse osmosis under counter sink replasement filters has a - 50 Gallon per Day NSF Certified Thin Film TFC Membrane is the main component of Avantapure RO-450 Reverse Osmosis Unit. Made with 100% Organic fine thin film flat sheet 99% reduction rate of bacteria, pesticides, herbicides, and heavy metals from tap water. Avantapure RO-450 reverse osmosis membrane has The micron rating of a thin film less than 1/10000th of a Micron which is 620,000 Times Finer Than A Human Hair 2,500 Times smaller than bacteria 20 Times smaller than any virus Product Features: 25-50 Gallons Per Day (15.8 Liters per Hour) Capacity 99% Stabilized Salt Rejection (Minimum Rejection 97%) NSF/ANSI Standard 58 listed Operating ConditionsPerformance specifications based on 500 ppm tap water, 50psi (0.35 MPa) applied pressure, 77°F (25°C) feed water temperature, feed water pH 7-8 and 15% recovery. Element permeate flow may vary ± 15%. Maximum operation pressure: 125 psi (0.86 MPa) Maximum feed flow rate: 2 gpm Maximum operating temperature: 113° F (45° C) Maximum feed water turbidity: 1 NTU Maximum feed water SDI (15min): 5 Chlorine tolerance: 0 Feed water pH range: 2-11 Minimum brine flow to permeate flow ratio: 4:1